Consider f(x)=cos^2x+2cosx over one complete period beginning with x=0

over what interval in this period is the curve concave up? show work if at all possible

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

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.

On a piece of paper graft y+2> -3x-3 then determine which answer matches the graph you drew