10.
Given: m21 = 2x + 40,
mZ2 = 2y + 40,
m23 = x + 2y
Find: m21, mL2, and m23

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?