Question

cell phones many cell phone plans have an option to include more than one phone. the function for the monthly cost of cell phone service from a wireless company is $f(x)=25x + 200$, where $x$ is the number of phones on the plan. find and interpret $f(3)$ and $f(5)$. $f(3) = $, which is the cost of a cell phone plan with phones for month, $f(5) = $, which is the cost of a cell phone plan with phones for month.

Explanation:

Step1: Calculate f(3)

Substitute x = 3 into f(x)=25x + 200. So, f(3)=25×3 + 200=75 + 200 = 275.

Step2: Interpret f(3)

f(3) is the cost for a plan with 3 phones for 1 month.

Step3: Calculate f(5)

Substitute x = 5 into f(x)=25x + 200. So, f(5)=25×5+200 = 125+200=325.

Step4: Interpret f(5)

f(5) is the cost for a plan with 5 phones for 1 month.

Answer:

f(3) = $275, which is the cost of a cell - phone plan with 3 phones for 1 month.
f(5) = $325, which is the cost of a cell - phone plan with 5 phones for 1 month.