Posted by **bryan** on Tuesday, December 16, 2008 at 12:51am.

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

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