Help look at the image

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

The triangles are similar. what is the value of x? show your work.

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.