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March 1, 2015

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

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 -
**Reiny**, Tuesday, December 16, 2008 at 1:21amno, 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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