Noah bought 3 books. Each book was the same price. After using a $10-off coupon, the total charge
was $20. Which equation can be used to find b, the
cost of each book?

Plzzz asapppppp what is the inverse of f if f(x)=^3 sqrt x-5

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

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?