Three times the total of a number and five to expression.

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

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

Are the corresponding angles congruent? explain why or why not.