Question

Please help me with these question i know that some are answered but there not.

Answer 1

1. A

2. A, B, D

Explanation:

The first one is pretty straightforward, divide 7^2 to both the denominator and numerator, so you get 1/7^2. 7^2 is 49, which is not 14, so A is false. Everything else produces 1/49 in some shape or form.

The second question is also relatively easy. A is correct because 1/4 is 4^-1 and (4^-1)^-1 is 4^1. B is also right because if you add all the exponents up, you basically get -5+6+1=2, and 2^2 is 4. C is wrong because (1/2)^2 is 1/4, not 4. D is correct because 2^(5-3) is 2^2, which is 4. E is wrong because 4^(4-2) is 4^2, which is 16, not 4.

Overall, it's not hard, nor does it take time, you just need to remember the basic formulas:
`(1)/(x^a) =x^{-a`,
`x^a * x^b=x^{a+b`, and
`(x^a)/(x^b) = x^{a-b`