1. Simplify the quotient (6.4 x 10^9) / (1.6 x 10^-3). Write the answer in scientific notation.

Question

My answer: 4 x 10^6?

Simplify.

2. a^16/a^4

My answer: a^12?

3. (4y^6/x^3)^2

My answer: 16^12/x^6?

4. (2/b^5)^-3

My answer: b^15/8?

Answer 1

#1 nope. If you subtract -3 from 9, you don't get 6.
4 x 10^12

#2 yes

#3 (4y^6/x^3)^2 = 16y^12/x^6

#4 yes