Chapter R.6, Problem 5E

For the scatter plots and graphs in Exercises 1– 9, determine which, if any, of the following functions might be the best model for the data

Linear, $f\left(x\right)=mx+b$

Quadratic, $f\left(x\right)=a{x}^2+bx+c,a>0$

Quadratic $f\left(x\right)=a{x}^2+bx+c,a<0$

Polynomial, neither quadratic nor linear

Exponential, $f\left(x\right)=a_0\cdot a^x,0<a\text{ or }a>1$ or $a>1$

(Source: U.S. Census Bureau.)