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timurjin [86]
2 years ago
8

the function y=5.45 + 1.05(x+7) can be used to determine the cost of in dollars for a prepaid cell phone plan of x minutes. What

is the rate if change of the cost, in dollars, with respect to the number of minutes purchased?​
Advanced Placement (AP)
1 answer:
Sidana [21]2 years ago
6 0

Answer:

The rate is 1.05

Explanation:

Given

y=5.45 + 1.05(x+7)

Required

Determine the rate

y=5.45 + 1.05(x+7)

Open brackets

y = 5.45 + 1.05 * x + 1.05 * 7

y = 5.45 + 1.05x + 7.35

Collect like terms

y = 1.05x + 7.35 + 5.45

Simplify like terms

y = 1.05x + 12.80

The general equation is represented as:

y = mx + b

Where

m = rate

By comparing y = mx + b to y = 1.05x + 12.80

m = 1.05

<em>Hence, the rate is 1.05</em>

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