Math

So this is a math quiz I took a few months ago and they said I can redo it, but I have to explain why the correct answer is correct... And idk.

Which equation represents 15 more than r is 61?

The answer is r + 15 = 61 but idk why?

What is the value of 4^2 -2 (3 x 5 + 1)

The answer is -16 but idk why?

What is the value of 7(10 - 2^3) + 8 % 2

The answer is 18 and idk y.

The empire state building in NY is 1,250 feet tall. It has 103 floors. Round to the nearest whole, What is the height of each floor?

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asked by Megan
  1. Don't wanna be impatient but its been over an hour and no one has helped me. :/

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    Please be patient. All tutors are volunteers, and sometimes a tutor may not be immediately available. Please be patient while waiting for a response to your question.

  3. well what is 15 more than r?
    it is 15 + r
    and it says 15 + r is 61

    4^2 = 4*4 = 16

    3 * 5 + 1 = 15 + 1 = 16
    2*16 = 32
    then
    16 - 32 = -16

    7(10 - 2^3) + 8 / 2
    2^3 = 2*2*2 = 8
    10 - 8 = 2
    7*2 = 14
    8/2 = 4
    14+4 = 18

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    posted by Damon
  4. Thank you so so so much @Damon, ur a lifesaver. :D

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    posted by Megan
  5. You are welcome.

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    posted by Damon

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