Question

PLEASE HELP

1. Is the rate of change in cost constant with respect to
the number of pencils bought? Explain.
Cost of Pencils
Number of Pencils 1
Cost ($)
0.25 1
1.75

Answer 1

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Explanation:

Answer 2

The rate of change in cost is constant with number of pencils.

To check if the rate of change is constant;

1 pencil = $0.25

This means ;

cost = 0.25 × number of pencils

Let's check;

For 4 pencils ;

cost = 0.25 × 4 = 1

For 7 pencils :

cost = 0.25 × 7 = 1.75

For 12 pencils :

cost = 0.25 × 12 = 3

Hence, rate of change in cost is constant.