2 what is the average rate of change of the function f(x) = 4(0.8)^x over the interval 1 ≤ x ≤ 3? a -1.152 b…

2 what is the average rate of change of the function f(x) = 4(0.8)^x over the interval 1 ≤ x ≤ 3? a -1.152 b -0.576 c 0.576 d 1.152

2 what is the average rate of change of the function f(x) = 4(0.8)^x over the interval 1 ≤ x ≤ 3? a -1.152 b -0.576 c 0.576 d 1.152

Answer

Explanation:

Step1: Encontrar f(1) y f(3)

$f(1)=4(0.8)^1 = 3.2$ $f(3)=4(0.8)^3=4\times0.512 = 2.048$

Step2: Aplicar la fórmula de tasa de cambio promedio

La fórmula para la tasa de cambio promedio de una función $y = f(x)$ en el intervalo $[a,b]$ es $\frac{f(b)-f(a)}{b - a}$. Aquí, $a = 1$, $b = 3$, entonces $\frac{f(3)-f(1)}{3 - 1}=\frac{2.048 - 3.2}{2}=\frac{- 1.152}{2}=-0.576$

Answer:

B. -0.576