Simplify the following expression 11^7/11^4

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?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]