Algebra 1
posted by Dave .
8.A number raised to a negative exponent is negative.
Always, never , or sometimes.
7. Evaluate 1/2a^4b^2 a = 2 and b = 4.
6. Simplify. Write in scientific notation. (9 x 10^3)^2
Thanks to anyone who helps right away and need right answer from the people who have already taken this test.

8.
4^3 = 1/4^3 = 1/64
(2)^3 = 1/(2)^3 = 1/8
7 , the way you typed it ...
(1/2)a^4 b^2
= (1/2)(1/(2)^4 (4)^2
= (1/2)(1/16)(16) = 1/2
6. (9 x 10^3)^2 = 1.8 x 10^6