12 hours (5880 divided by 490)
#1 answer is D and #2 answer is D also
Answer:

Step-by-step explanation:
To isolate r, we're going to need to do some algebraic manipulation.

Multiply both sides by r:

Divide both sides by a:

Hope this helps!
Find two pefect lines that touches the middle then do rise over run and that will be your slope