U = (9, 2) v = (-5, -2) 2u - 3v =

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

a. is correct

d

because parallelagram have all 4 angels the same size dependeing and a rectangle and square are oth parallelogram