Simplify and express each of the following in the exponential form 1. 5^4x x^10 y^5
5^4 x x^7 y^4
2. 2/3 whole cubed 5 x 3/5 whole cubed 5
3. 9^8 x(x^2) whole cubed 5
(27) whole cubed 4 x (x^3) whole cubed 2

Q1 and 3 are fractions 1 over another.

PL HELP

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?