exam Maths Puzzle Numerical Ability

I have no clue if finding the rate of change goes in this section:

The question says,

find the rate of change for each situation.

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exam Other Question

Not in book

Write the slope-intercept form of an equation of the line that passes through (-2,0) and is parallel to the graph of y=-3x-2

Can someone help me with this one.

The official record for swimming the English Channel, a distance of 18 miles, is held by Penny Dean, who completed her swim in 7 hrs 40 minutes What was her average speed, in miles per hour?