math check

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Simplify
1) (5t)(5t)^3

My answer: 5t^15

Write the number without exponents
2) 8.78x10^5

My answer: 878,000,000

Multiply.
3) (x+9)^2

My answer: 9x^18

  • math check -

    no, on all three

    (5t)(5t)^3
    = (5t)^4
    = 625t^4

    8.78x10^5
    = 8.78x100000
    = 878000


    (x+9)^2
    = (x+9)(x+9)
    = x^2 + 9x + 9x + 81
    = x^2 + 18x + 81

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