Simplify the expression. Math 8

y^4 x 5y^-3=?

Sorry guys but as you have a small brain

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?