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Rate of change:

The initial value is 20

The equation:

Step-by-step explanation:

Given

The attached table

Solving (a): The rate of change (m)

This is calculated as:

Where:

So:

Solving (b): The initial value

Here, we make use of point (0, y) to calculate the initial value:

Where

So:

Multiply both sides by 3

Solving (c): The equation

This is calculated using:

Where:

So, we have:

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