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  1. #901
    Wrongdoers KevinMK0831's Avatar
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    A playground is being designed where children can interact with their friends in certain combinations.

    If there is 1 child, there can be 0 interactions.
    If there are 2 children, there can be 6 interactions.
    If there are 3 children, there can be 15 interactions.
    If there are 4 children, there can be 27 interactions.

    How many interactions will there be for 7 children?
    Answer
    108
    60
    81
    105
    1 points
    Question 2

    A playground is being designed where children can interact with their friends in certain combinations.

    If there is 1 child, there can be 0 interactions.
    If there are 2 children, there can be 3 interactions.
    If there are 3 children, there can be 9 interactions.
    If there are 4 children, there can be 18 interactions.

    Which recursive equation represents the pattern?
    Answer
    an = an – 1 + (n – 1)3
    an = an – 1 + 3(n – 1)
    an = an – 1 + 3(n – 1)
    an = an – 1 + (3n – 1)
    2 points
    Question 3

    Shirley purchased a plot of land for $19,500. The land appreciates about 3.9% each year. What is the value of the land after five years?
    Answer
    $23,302.50
    $23,610.89
    $15,982.75
    $19,818.94
    3 points
    Question 4

    Luke purchased a motorcycle for $8,765. It depreciates about 5.3% each year. What is the value of the motorcycle after five years?
    Answer
    $6,442.27
    $6,675.78
    $8,573.14
    $11,347.33
    3 points
    Question 5

    The yearly attendance at a local movie theater is 56,000 and grows continuously at a rate of 4.2% each year. What is the approximate attendance at the movie theater in nine years?
    Answer
    57,789
    77,168
    81,724
    81,096
    3 points
    Question 6

    The number of customers that visit a local small business is 51,200 and has been continuously declining at a rate of 3.8% each year. What is the approximate number of customers that visit the business in 14 years?
    Answer
    29,766
    87,159
    30,076
    33,690
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  2. #902
    on the road to aesthetics TheKeo's Avatar
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    Originally Posted by KevinMK0831 View Post
    Question 3

    Shirley purchased a plot of land for $19,500. The land appreciates about 3.9% each year. What is the value of the land after five years?
    Answer
    $23,302.50
    $23,610.89
    $15,982.75
    $19,818.94
    3 points
    Question 4

    Luke purchased a motorcycle for $8,765. It depreciates about 5.3% each year. What is the value of the motorcycle after five years?
    Answer
    $6,442.27
    $6,675.78
    $8,573.14
    $11,347.33
    3 points
    Question 5

    The yearly attendance at a local movie theater is 56,000 and grows continuously at a rate of 4.2% each year. What is the approximate attendance at the movie theater in nine years?
    Answer
    57,789
    77,168
    81,724
    81,096
    3 points
    Question 6

    The number of customers that visit a local small business is 51,200 and has been continuously declining at a rate of 3.8% each year. What is the approximate number of customers that visit the business in 14 years?
    Answer
    29,766
    87,159
    30,076
    33,690
    Q3)
    1.039u(n-1), where u1=$19,500
    =$23,610.89

    Q4)
    0.947u(n-1),where u1=8765
    =$6,675.78

    Q5)
    1.042u(n-1), where u1=56,000
    =77,168

    Q6)
    0.962u(n-1), where u1=51,200
    =29,766
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  3. #903
    Registered User ocarinanoob's Avatar
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    Calculate the EMF of a dry cell that supplies 4.5J of energy to every 3.0 C of charge that passes through the cell
    Goals D/S/B = 405/315/225
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  4. #904
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    A point is moving along the curve y=radical(x) in such a way that it moves 3 units per minute
    At what rate does the point change when x=3e?

    Need reply ASAP.
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  5. #905
    Wrongdoers KevinMK0831's Avatar
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    Question 2

    Timothy deposited $1,023.48 in a savings account that earns 2.4% simple interest. What will Timothy’s account balance be in 5 months?
    Answer
    $1,023.48
    $1,033.71
    $1,048.04
    $1,146.30

    Question 3

    Newton currently has a balance of $1,716.18 in an account he has held for 29 years. He opened the account with an initial deposit of $784. What is the simple interest rate on the account?
    Answer
    4.1%
    3.4%
    7.5%
    1.9%

    Question 4

    Jerry currently has an account balance of $1,109.80. His initial deposit on the account was $775 and it earned 2.7% simple interest. How long has Jerry held the account?
    Answer
    37 years
    11 years
    16 years
    53 years


    Question 8

    Galvin has deposited $879 in a savings account that earns interest at a rate of 1.8% compounded quarterly. What will the account balance be in 14 years?
    Answer
    $894.82
    $1,582.20
    $1,130.28
    $2,387.07

    Question 10

    Karen currently has an account balance of $7,062.25. She opened the account 17 years ago with a deposit of $2,640.95. If the interest compounds monthly, what is the interest rate on the account?
    Answer
    5.8%
    4.1%
    0.5%
    7.2%

    Question 11

    Whitney opened a savings account 25 years ago with a deposit of $4,280.83. The account has an interest rate of 5.4% compounded twice a year. How much interest has Whitney earned?
    Answer
    $4,511.99
    $11.661.19
    $16,219.97
    $11,939.14

    Question 12

    Rhonda deposited $4,227.29 into a savings account with an interest rate of 4.9% compounded monthly. About how long will it take for the account to be worth $9,000?
    Answer
    15 years, 6 months
    33 years, 2 months
    15 years, 10 months
    3 years, 8 months

    Question 13

    Perry deposited $8,250 into a savings account 13 years ago. The account has an interest rate of 4.7% and the balance is currently $14,988.59. How often does the interest compound?
    Answer
    quarterly
    daily
    monthly
    annually

    Question 15

    A video game has been developed whereby the player must earn a certain number of experience points before progressing to the next level.

    On level 1, a player must earn 2 experience points.
    On level 2, a player must earn 4 experience points.
    On level 3, a player must earn 7 experience points.
    On level 4, a player must earn 11 experience points.

    Which recursive equation represents the pattern?
    Answer
    an = an – 1 + n
    an = an – 1 – n
    an = an – 1 + 2n
    an = an – 1 – 2n

    Question 16

    Tonya purchased a building for $295,150. The land appreciates about 5.6% each year. What is the value of the land after 17 years?
    Answer
    $745,297.04
    $110,806.87
    $319,460.14
    $576,132.80

    Question 17

    Malory purchased a car for $21,825. It depreciates about 5.8% each year. What is the value of the car after six years?
    Answer
    $21,199.67
    $15,249.64
    $30,610.35
    $14,229.90

    Question 18

    The yearly attendance at a local restaurant is 36,500 and grows continuously at a rate of 5.6% each year. What is the approximate attendance at the restaurant in 12 years?
    Answer
    70,188
    71,472
    61,028
    38,597


    The yearly attendance at a local restaurant is 36,500 and grows continuously at a rate of 5.6% each year. What is the approximate attendance at the restaurant in 12 years?
    Answer
    70,188
    71,472
    61,028
    38,597

    Question 19

    The population of a small town is 47,288 and has been continuously declining at a rate of 2.4% each year. What is the approximate population of the town in 21 years?
    Answer
    78,277
    23,455
    28,392
    28,567



    Please put the correct number and if you get it wrong it will come up, negs =/. Last test I got a 7/15. Help!
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  6. #906
    Dat Dere Cell-Tech Cell-Tech's Avatar
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    You don't have a specific question or something you're stuck on... you just want people to simply do your entire sheet of homework for you? And then threaten negs if they get them wrong? This can't be serious, get out of here with that.
    "Adversity reveals genius, prosperity conceals it."

    Think about what you want in life. Then ask yourself what you're doing to achieve it.
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  7. #907
    Wrongdoers KevinMK0831's Avatar
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    no ******* last time someone did the for me and got 8/15 wrong
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  8. #908
    Registered User ocarinanoob's Avatar
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    Originally Posted by ocarinanoob View Post
    Calculate the EMF of a dry cell that supplies 4.5J of energy to every 3.0 C of charge that passes through the cell
    never mind, figured how to do it by opening a book
    Goals D/S/B = 405/315/225
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  9. #909
    Banned crazed31's Avatar
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    if anybody wants to write a biology lab report for me pls respond. its some online school sh!t brahs, very easy srs.

    will rep some greys.
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  10. #910
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    Originally Posted by KevinMK0831 View Post
    no ******* last time someone did the for me and got 8/15 wrong
    lmfao
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  11. #911
    Registered User SlickSikh's Avatar
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    If tan2x= -b/a , pi/2 =< 2x =< pi, then determine an expression for sinxcosx in terms of a and b.
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  12. #912
    Unregistered User smbrown3706's Avatar
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    Originally Posted by SlickSikh View Post
    If tan2x= -b/a , pi/2 =< 2x =< pi, then determine an expression for sinxcosx in terms of a and b.
    k bro, let me take you through this step by step:
    1. tan2x = sin2x/cos2x by definition
    2. sin2x = 2sinxcosx and cos2x= 2(cos(^2)x)-1 by double angle
    3. tan2x = 2sinxcosx/(2(cos(^2)x)-1) = -b/a ... just plugging in step 2 into the result of step 1
    4. 2asinxcosx = -2b(cos(^2)x)-b by cross multiplying
    5. sinxcosx = (-b/a)(cos(^2)x)-(b/2a) by dividing by 2a

    now that you have a formula, check your bounds, i.e. plug in pi/2 and pi

    6. (-b/a)(cos(^2)x)-(b/2a) at pi/2 = 0-(b/2a) = -b/2a since cos(pi/2) is 0.
    7. (-b/a)(cos(^2)x)-(b/2a) at pi = (-b/a)-(b/2a) = -3b/2a since cos(pi) = -1, so cos(^2)pi = -1*-1 = 1

    To conclude, 0<=sinxcosx<=(-3b/2a)

    I'm not sure if this is what your teacher wants, but I think it is...
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  13. #913
    The Game benchpresschick's Avatar
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    Anybody taken the AP Euro history test? If you have, hit me up.. i need help :/
    Insanity: doing the same thing over and over again and expecting different results.

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  14. #914
    Registered User lucasp12's Avatar
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    Studying for a test tomorrow...And I have a question. I'm doing a problem to find critical values of f(x)=tanx and I got the derivative; f'(x)=sec^2x So If i set that to zero what would the critical values be?
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  15. #915
    Dat Dere Cell-Tech Cell-Tech's Avatar
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    Originally Posted by lucasp12 View Post
    Studying for a test tomorrow...And I have a question. I'm doing a problem to find critical values of f(x)=tanx and I got the derivative; f'(x)=sec^2x So If i set that to zero what would the critical values be?
    A critical point is either where the derivative equals zero or where the function can't be differentiated. sec^2x = 1/cos^2x which never equals 0. But the function does not exist when the denominator equals 0 so it obviously can't be differentiated there. So the critical points are basically when cos^2x = 0

    cos^2x = 0 --> cosx = 0 --> x = n*pi/2 where n is an odd integer e.g. 1,3,5,7,9,...
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  16. #916
    Unregistered User smbrown3706's Avatar
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    Originally Posted by benchpresschick View Post
    Anybody taken the AP Euro history test? If you have, hit me up.. i need help :/
    I had AP Euro years ago, was an awesome class, what do you need help with?
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    Registered User lucasp12's Avatar
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    Originally Posted by Cell-Tech View Post
    A critical point is either where the derivative equals zero or where the function can't be differentiated. sec^2x = 1/cos^2x which never equals 0. But the function does not exist when the denominator equals 0 so it obviously can't be differentiated there. So the critical points are basically when cos^2x = 0

    cos^2x = 0 --> cosx = 0 --> x = n*pi/2 where n is an odd integer e.g. 1,3,5,7,9,...
    Got it, Thanks for the help!
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    Originally Posted by smbrown3706 View Post
    I had AP Euro years ago, was an awesome class, what do you need help with?
    Haha. Evvvverythinggg. It's the worst class everrr!! How'd you survive and pass???
    Insanity: doing the same thing over and over again and expecting different results.

    Little guys can do big things too!

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    Writing a mock interview and resume. The applicant? Sir Francis Bacon. I need interview questions! I have no idea how to go about this..
    Insanity: doing the same thing over and over again and expecting different results.

    Little guys can do big things too!

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    Originally Posted by benchpresschick View Post
    Writing a mock interview and resume. The applicant? Sir Francis Bacon. I need interview questions! I have no idea how to go about this..
    I survived and actually ended up liking the class by having a good teacher. AP US history isn't my thing though, it was boring as hell. As for the interview, I have no idea, history isn't my strongest, I'm a math person.
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    1) When a pendulum 0.5m long swings back and forth, its angular displacement Ɵ from rest position, in radians is given by Ɵ=1/4sin((pi/2)t), where t is the time, in seconds. At what time(s) during the first 4 s is the pendulum displaced 1 cm vertically above its rest position? (assume the pendulum is at its rest position at 0).
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    Registered User Faahad's Avatar
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    Serious

    Whats the qualification of the guys who are answering these questions and I constantly feel an existing stereotype of bodybuilders as dumb . I think it's time that was changed
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    Dat Dere Cell-Tech Cell-Tech's Avatar
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    Originally Posted by SlickSikh View Post
    1) When a pendulum 0.5m long swings back and forth, its angular displacement Ɵ from rest position, in radians is given by Ɵ=1/4sin((pi/2)t), where t is the time, in seconds. At what time(s) during the first 4 s is the pendulum displaced 1 cm vertically above its rest position? (assume the pendulum is at its rest position at 0).
    The pendulum is .5m long so you wanna figure out how many radians you need to move it in order to raise its height by 1cm or .01m You can draw a right triangle with a hypotenuse of .5 and a vertical leg of .49, what you get is the arccosine of .49/.5 which is about .2 radians.

    Now let's look at your given function of Ɵ=1/4sin((pi/2)t) we know theta is .2 so:

    .2 = .25sin(pi/2*t) We wanna solve for t but let's keep in mind sin is a cyclic function, so t will have multiple answers to give a theta of .2 (we want every answer within the first 4 seconds).


    .2 = .25sin(pi/2*t) --> .8 = sin(pi/2 *t) ; arcsine .8 to get: .9273 = pi/2 *t --> t= .59 seconds

    If we plug .59 seconds in as t we'll get sin(.92677) which is .8 so need every value of x where sin(.92677+2npi) where n is an integer.

    The best way to do that may just be to keep finding answers for .92677+2npi then setting them equal to pi/2 *t solving for t and stopping once t passes 4 seconds. Try it out.


    Originally Posted by Faahad View Post
    Whats the qualification of the guys who are answering these questions and I constantly feel an existing stereotype of bodybuilders as dumb . I think it's time that was changed
    I'm a physics major
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    physics major from where?im almost out of high school and want some advice on how you manage studying and working out, nit many guys can advice me on it.
    Originally Posted by Cell-Tech View Post
    The pendulum is .5m long so you wanna figure out how many radians you need to move it in order to raise its height by 1cm or .01m You can draw a right triangle with a hypotenuse of .5 and a vertical leg of .49, what you get is the arccosine of .49/.5 which is about .2 radians.

    Now let's look at your given function of Ɵ=1/4sin((pi/2)t) we know theta is .2 so:

    .2 = .25sin(pi/2*t) We wanna solve for t but let's keep in mind sin is a cyclic function, so t will have multiple answers to give a theta of .2 (we want every answer within the first 4 seconds).


    .2 = .25sin(pi/2*t) --> .8 = sin(pi/2 *t) ; arcsine .8 to get: .9273 = pi/2 *t --> t= .59 seconds

    If we plug .59 seconds in as t we'll get sin(.92677) which is .8 so need every value of x where sin(.92677+2npi) where n is an integer.

    The best way to do that may just be to keep finding answers for .92677+2npi then setting them equal to pi/2 *t solving for t and stopping once t passes 4 seconds. Try it out.




    I'm a physics major
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    Chem bros i need your help!!

    What types of solvents would interfere with UV analysis? (relating to Ultraviolet-visible spectroscopy)
    Some solvents are: Acetic acid, Acetone, benzene, chloroform, MTBE, Hexane, Octane, Toluene, Water

    In an easier way, what causes interference in UV-Vi spectroscopy?
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    Ok brahs this ones easy...

    I need to come up with a 3 topic for a research paper (the theme is shakespeare or elizabethan england)

    I already have one "Why Shakespeare should not be taught in school/forced upon unwilling minds"
    but i need 2 more, preferably some that would be intredasting
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    Registered User fereldan's Avatar
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    Please show all work.

    Q1. A 75 kg skydiver falls at a terminal velocity (220 km/h) before pulling the chute. If she slows to 25 km/g in 3.8 s, determine the average force of air friction that acts on her during her deceleration.

    Q2a. A 1350 kg crash test car strikes a cement wall at 24.0 m/s and bounces back at 8.0 m/s. If it is in contact with the wall for 0.90 s, what force did the wall exert on the car?

    Q2b. If the same car had no crumple zones, then it would be in contact with the wall for 0.080 s. What force would the wall exert in this case?

    I have a physics test tomorrow. If you could help me solve these problems, I would be so thankful.
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    Originally Posted by fereldan View Post
    Please show all work.

    Q1. A 75 kg skydiver falls at a terminal velocity (220 km/h) before pulling the chute. If she slows to 25 km/g in 3.8 s, determine the average force of air friction that acts on her during her deceleration.
    F=ma. you have a change in velocity over time-> acceleration, and you have a mass.

    Q2a. A 1350 kg crash test car strikes a cement wall at 24.0 m/s and bounces back at 8.0 m/s. If it is in contact with the wall for 0.90 s, what force did the wall exert on the car?

    F=(change in momentum)/(change in time) from the definition of impulse: F*delta(t)=delta(p)

    your momentum is simply mass*velocity(note that that the velocity is in the negative direction when it bounces back). so calculate the change in momentum over the time of contact


    Q2b. If the same car had no crumple zones, then it would be in contact with the wall for 0.080 s. What force would the wall exert in this case?

    same as above: just plug in the new delta(t)

    I have a physics test tomorrow. If you could help me solve these problems, I would be so thankful.
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    Cool Anyone good with genetics?

    couple questions that have me confused. Wondering if anyone could help me out?
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