40 POINTS PLEASE HELP!! Select the expressions that are polynomials.
x^2/7+1
x^-3+4x
-2x^3+2x+4
6x-x^3+4x^2

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)?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals