How do i find the ampitude of this function: y=4sin(1/2x)

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Could someone with number 1 and 2

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