Please help me I am stuck its due at 10:30

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)?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).