Which number produces an irrational number when multiplied by 0.4

What is the ratio of the change in y-values to the change in x-values for this function? a) 1: 13 b) 2: 5 c) 5: 2 d) 13: 1

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

5cakes cost 3.50 how much do 7 cakes cost