Posted by **Sharon** on Tuesday, November 8, 2011 at 3:58pm.

Please check these answers.

Multiply

-7(2a2 -4) = -14a2 + 28

Multiply

0.5(a + b -5) = 0.5a + 0.5b - 2.5

Factor

bx - by + bz = b(x - y + z)

Combine like terms (simplify)

12x + 4 - 11y - 6x - 9 - y = 6x - 12y - 5

Evaluate the expression

3x2y when x = 3 and y = 5

Answer: 135

Write as a fraction and simplify

Z-4

Answer: 1/z-4

Write using negative exponents

1/64

Answer: -6-4

Multiply and simplify

3-small2 • 3small6 = 81

Divide and simplify

4-small2/4small4 = 16

Divide and simplify

Y/y-5 = 1

Simplify

(2small3) -small2 =32

Simplify

(x-small1 ysmall1) small5 = ysmall5/xsmall5

Write in scientific notation

0.000005 = 5x10 -small6

Write in standard notation

31 x 10small7 =310,000,000

Perform the indicated operations (give your answer in scientific notation)

(5x10small2) x (5.6x10small4) = 2.8x10small6

Solve

X - 2.1 = -7.5

Answer: x = -5.4

Solve

2.3 = -y/2

Answer: y = -4.6

Solve

2 - x = 11 (x - 1)

Answer: x = 13/12

Please check my answers.

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