Instantaneous rate of change

As you hve not posted in the "calculus" section, it's a bit tough to know how to provide assistance. Have we ONLY algebra? Can we use calculus? A picture might work.

Guidance?
 
And please include the full text of your question within the actual post, where it may easily and clearly be read. Splitting a sentence between the subject line and the post can be confusing and/or misleading. Thank you.

Eliz.
 
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