Indicate which property is illustrated in step 1.

step 1 8 + (5 + 9) + 0 = 8 + (9 + 5) + 0
step 2 = (8 + 9) + (5 + 0)
step 3 = (8 + 9) + 5
step 4 = 17 + 5

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?

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?