What is x in the eqaution -3x + 7 = 1

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)?

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?