Someone ! i'm bad at ! (5b - 9) - 3(8 - 2b) also, could you give me tips on how to solve these kind of problems? . - a math disaster

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Write 17/20 as a decimal and as a percent.

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?