Pls help me i am on a time limit

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)?

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.