What's this? I don't understand

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

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.

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)