Construct a triangle with the given angle measures and classify the triangle: 15, 75, 90

Which is the correct excel formula for the 80th percentile of a distribution that is n(475, 33)? =norm.dist(80,475,33,1) =norm.inv(0.80,475,33) =norm.s.inv((80-475)/33)?

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys