Rewrite this as a normal number: 8.404 times 10^(-7)

answer = __________________

Answers may be entered with or without commas, but answers must be exact (no rounding at all). Also, do not include any spaces in your answer.

Convert the fraction 12/6 to a decimal. Round your answer to three (3) decimal places if necessary:

Answer = __________________

Completely simplify the expression

-3 y + 8 y -9 y

Answer = __________________

Completely simplify the expression

8 w + 4 -11 w -10

Answer = __________________

Simplify: 2 x^4 + 5 x^4

Simplify: 5 x^5 - 9 x^5

Simplify: 4 x^2 + 5 x^4 + 7 x^2 + 6 + 8 x^4

The expression (4 x^2+6 x+5)+(5 x^2-6 x-2) equals
__________________ x^2 +__________________ x+__________________

Jon has two trees in his yard. One is 25 feet taller than the other. If we let h be the height of the shorter tree, write an algebraic expression for the sum of the two trees' heights. Be sure to simplify your expression.

Here is a figure made of two rectangles.

What is the perimeter of the figure? Answer in terms of y and simplify your expression.

__________________ cm