Write the expression sin 37 in terms of cosine

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?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16