Can odd numbers under 20 be composite numbers

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?