Answer:
p=15
Step-by-step explanation:
Im not quite sure but i think the unit rate is 150. Hope this helps!!
Answer:

Step-by-step explanation:
The formula of the circumference of a circle is
.
The length of an arch can be found by using the ratio of circumference to the arc.
First, find the circumference of the circle:

Then you find the ratio:
The length of the arc is 90/360, which is 1/4, of the circumference.
Finally, find the length of the arc:
or 
I hope this helps :)
$91/ 7 = $13 per dog
$117/$13 = 9 dogs
He washed 9 dogs