From the explanation below,
a= -10 and b= -4
Sin(A) = opposite/hypotenuse = 12/13
Cos(A) = adjacent/hypotenuse = 5/13
Tan(A) = opposite/adjacent = 12/5
Lovely let’s do the cha cha side
Multiply your total by your percentage
90 * .80 = 72
72 is the number of questions she answered correctly