Can anyone please help me with these 7th grade problems?

Question

I need help and lots of it!!!!! I do not really understand the Negative and Zero exponents lesson and here are the questions I have: How do you simplify the expressions 4^-3, -3^-3, (-4)^-2, x^-3, (3/2)^-3, a^-4b, and -5u^-2! PLEASE HELP ME!!!!!

Answer 1

this isn't seventh grade math. but you put it under one. flip it and make it positive. for example,  4^-3 = 1/ 4^3  

Answer 2

4^-3 = -12 (a negative times a positive is always a negative.)

-3^-3 = +9 (a negative times a negative is always a positive.)

(-4)^-2= +8 (same rule as above.)

x^-3= -3x (you just add the variable and it's a negative because of the positive variable.)

a^-4b = -4ab (same rule as above)

-5u^-2 = 10u (because theres 2 negatives it becomes a positive and you add the variable.)

heres a chart to help you.

(-) (-) = +

(+) (+) = +

(-) (+) = -

(+) (-) = -  

Answer 3

A negative exponent means the same as the reciprocal of the positive exponent (one over the positive exponent).

4^-3 = 1/4^3

-3^-3 = 1/-3^3

http://www.purplemath.com/modules/simpex...

A zero exponent always equals 1.

2^0 = 1

100^0 = 1

45^0 = 1