Iwasn't able to attend class so i don't understand the work..these are the practice problems

Aright triangle includes one angle that measures 30º. what is the measure of the third angle? a. 30º b. 90º c. 60º d. 130º

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?