Answer:
B. 0.159
A = taking history class
B= taking sociology class
P(A) = 0.051
P(B) = 0.32
A ÷ B = 
= 0.159 Rounded the the nearest hundredth
Yes your answer should be c;
Hello,
x²-64=(x+8)(x-8)
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75°+75°=150°
angles in a triangle add up to 180°
180°-150°=30°
c) x=30°