An exterior angle of a triangle is equal to the sum of opposite angle

Write a polynomial that fits the description: a third-degree polynomial with leading coefficient -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?

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?