# math check

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

Write the number without exponents
2) 8.78x10^5

Multiply.
3) (x+9)^2

• 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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