1) Simplify 16x – 7y - 19x - 4y

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?

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120