Which relation graphed below is a function?

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

Is there an x intercept in the equation 60*1.15^x

Which equation could represent the relationship shown in the scatter plot? y=−3x−2 y=−3/4x+10 y=−2/3x+1 y=9x−12 scatter plot with x axis labeled variable x and y axis labeled variable y. points go from upper left to lower right.