Area=legnth times width
we notice this is a special case
(a+b)(a-b)=a^2-b^2
area=(a+3b)(a-3b)=a^2-9b^2
area=a^2-9b^2
Answer:
Step-by-step explanation:
I think it’s a
We can set it up like this:

This states that Sam can drive 192 miles in 4 hours and 2220 miles in x hours. To solve, we can use cross-multiplication:

It will take Sam 46.25 hours to drive the whole trip, or 46 hours and 15 minutes.
She sailed for 7 hours and she sailed 77 hours in all