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anonymous

  • one year ago

Anybody willing to help me with three easy questions please! I will fan and medal and love you forever <3

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  1. anonymous
    • one year ago
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    If h(x) = 4x − 8 and j(x) = −x, solve h[j(3)] and select the correct answer below. A. −36 B. −20 C. 1 D. 4

  2. anonymous
    • one year ago
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    a) what is \(j(3)\)?

  3. anonymous
    • one year ago
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    J is -x and 3 is just 3.... wait are u asking me or are you confused? :)

  4. jim_thompson5910
    • one year ago
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    satellite73 knows the answer s/he is asking you to see if you know it

  5. anonymous
    • one year ago
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    \[j(x)=-x\] so \[j(\spadesuit)=-\spadesuit\] and \[j(\xi)=-\xi\] so what is \[j(3)\]?

  6. anonymous
    • one year ago
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    Oh ok... Yes so I did 4x-8[-x(3)] but i keep getting 28

  7. anonymous
    • one year ago
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    umm... -3?

  8. jim_thompson5910
    • one year ago
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    j(3) is -3, yes

  9. anonymous
    • one year ago
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    ok thanks

  10. anonymous
    • one year ago
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    whew b) what is \(h(-3)\)?

  11. jim_thompson5910
    • one year ago
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    notice how satellite73 replaced the "j(3)" with "-3" going from h[ j(3) ] to h(-3) this only works because j(3) = -3

  12. anonymous
    • one year ago
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    4x+24?

  13. jim_thompson5910
    • one year ago
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    replace every x in h(x) = 4x − 8 with -3

  14. anonymous
    • one year ago
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    oh ok so 4(-3) or -12 -8?

  15. anonymous
    • one year ago
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    \[h(\diamondsuit)=4\times\diamondsuit-8\]\[h(\Phi)=4\times \Phi -8\]\[h(-3)+?\]

  16. jim_thompson5910
    • one year ago
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    yeah just compute -12-8

  17. anonymous
    • one year ago
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    -20

  18. jim_thompson5910
    • one year ago
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    correct

  19. anonymous
    • one year ago
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    omg tysm!!

  20. anonymous
    • one year ago
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    I need help with 2 more... please

  21. jim_thompson5910
    • one year ago
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    go ahead

  22. anonymous
    • one year ago
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    Ray is purchasing a laptop that is on sale for 25% off. He knows the function that represents the sale price of his laptop is c(p) = 0.75p, where p is the original price of the laptop. He also knows he has to pay 8% sale's tax on the laptop. The price of the laptop with tax is f(c) = 1.08c, where c is the sale price of the laptop. Determine the composite function that can be used to calculate the final price of Ray's laptop by solving for f[c(p)]. A. f[c(p)] = 1.83p B. f[c(p)] = 1.83cp C. f[c(p)] = 0.81p D. f[c(p)] = 0.81cp

  23. jim_thompson5910
    • one year ago
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    \[\Large f(c) = 1.08c\] \[\Large f(\color{red}{c}) = 1.08\color{red}{c}\] \[\Large f(\color{red}{c}) = 1.08(\color{red}{c})\] \[\Large f(\color{red}{c(p)}) = 1.08(\color{red}{c(p)})\] \[\Large f(\color{red}{c(p)}) = ??\]

  24. anonymous
    • one year ago
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    um...

  25. jim_thompson5910
    • one year ago
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    \[\Large f(c) = 1.08c\] \[\Large f(\color{red}{c}) = 1.08\color{red}{c}\] \[\Large f(\color{red}{c}) = 1.08(\color{red}{c})\] \[\Large f(\color{red}{c(p)}) = 1.08(\color{red}{c(p)})\] \[\Large f(\color{red}{c(p)}) = 1.08(\color{red}{0.75p})\] \[\Large f(\color{red}{c(p)}) = ??\] In the second to the last step, I replaced c(p) with 0.75p because c(p) = 0.75p

  26. anonymous
    • one year ago
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    0.81

  27. jim_thompson5910
    • one year ago
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    0.81p

  28. jim_thompson5910
    • one year ago
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    don't lose the p

  29. jim_thompson5910
    • one year ago
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    the c or c(p) goes away because it is replaced by 0.75p

  30. anonymous
    • one year ago
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    oh ok got it so c right

  31. jim_thompson5910
    • one year ago
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    yes

  32. anonymous
    • one year ago
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    The following table shows the length and width of two rectangles: Length Width Rectangle A 2x + 8 x − 1 Rectangle B 3x + 5 2x − 2 Which expression is the result of the perimeter of rectangle B minus the perimeter of rectangle A? A. 2x − 4 B. 8x + 10 C. 16x + 20 D. 4x − 8

  33. anonymous
    • one year ago
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    Thank you! Last question

  34. jim_thompson5910
    • one year ago
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    hint: Perimeter = 2*(Length + Width)

  35. anonymous
    • one year ago
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    ok so, 2*(2x+8)+(x-1) for the first one right?

  36. jim_thompson5910
    • one year ago
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    2*[ (2x+8)+(x-1) ] actually

  37. anonymous
    • one year ago
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    oh ok now what? when i simplify it i get 5x+15

  38. jim_thompson5910
    • one year ago
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    you should get 2*(3x+7) = ???

  39. anonymous
    • one year ago
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    ohh i see! ok so 6x+14?

  40. jim_thompson5910
    • one year ago
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    yes, that is the perimeter of rect A

  41. jim_thompson5910
    • one year ago
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    find the perimeter of rect B

  42. anonymous
    • one year ago
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    so for rectangle B would be 2*[ (3x+5)+(2x-2) ]

  43. jim_thompson5910
    • one year ago
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    yes

  44. jim_thompson5910
    • one year ago
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    I'll be right back

  45. anonymous
    • one year ago
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    ok

  46. anonymous
    • one year ago
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    is the answer 10x+6

  47. jim_thompson5910
    • one year ago
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    perimeter of rect A = 6x+14 perimeter of rect B = 10x+6

  48. jim_thompson5910
    • one year ago
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    subtract the two perimeters

  49. anonymous
    • one year ago
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    Well the directions say "perimeter of rectangle B minus the perimeter of rectangle A" but when i do that i get 4x+8 which is none of the options

  50. jim_thompson5910
    • one year ago
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    10x - 6x = 4x ... correct 6 - 14 = 8 ... incorrect

  51. anonymous
    • one year ago
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    Now I'm confused

  52. jim_thompson5910
    • one year ago
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    B - A = (10x+6) - (6x+14) = 10x + 6 - 6x - 14 = ??

  53. anonymous
    • one year ago
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    i got 4x+20

  54. anonymous
    • one year ago
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    Did you mean to put 10x + 6 - 6x + 14 = ?

  55. jim_thompson5910
    • one year ago
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    no the negative distributes through

  56. jim_thompson5910
    • one year ago
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    - (6x+14) = -6x-14

  57. anonymous
    • one year ago
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    oh ok so it would be the last one right?

  58. jim_thompson5910
    • one year ago
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    yeah 4x-8

  59. anonymous
    • one year ago
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    Thank you so much!!!!!!!!

  60. jim_thompson5910
    • one year ago
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    no problem

  61. denisaboichuk
    • one year ago
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    0

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