If Frances can paint 15 of a wall in 20 minutes, how long will it take her to paint a room with 4 walls

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?

Prove that quadrilateral is a rhombus.

In the diagram of circle o, what is the measure of zabc?