Can some one tell me this in standard form I’m timed

What is the period of the sinusoidal function ?

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

An isosceles trapezoid with a perimeter of 42 inches. each of the congruent non parallel sides is 5 inches long, and the trapezoid is 3 inches tall. how long are the two parallel sides? a. 10 in, 22 in b. 16 in, 16 in c. 10 in, 16 in d. 12 in, 20 in