Please help me with 20,21 please

What value of x is in the solution set of –5x – 15 > 10 + 20x?

Using two or more complete sentences, describe how you can find a vector parallel to b=-2,3

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.