1) calculate f(3), that means substituting the x in the formula, by the number 3.
f(3) = 2^x + 1
f(3)= 2^3 + 1
f(3) =9 You don't even need to calculate it. Just by looking at the graph you see that when x=3 the "blue line" will match with y=9
2)calculate f(1), that means substituting the x in the formula, by the number 1.
f(1) = 2^x + 1
f(1)= 2^1 + 1
f(1) =3 Just by looking at the graph you see that when x=1 the "blue line" will match with y=3.
3) To calculate the average rate of change, you need to follow a formula. (b is 3 and a is 1)
[tex] \frac{f(b)-f(a)}{b-a} [/tex]
[tex] \frac{f(3)-f(1)}{3-1} [/tex]
