The ODE is separable:

Integrating both sides gives

Answer:
50.24
Step-by-step explanation:
1/4x3.14xr^2
r=16 because of the length
90/360= 1/4
so
1/4x3.14x16^2/4
=50.24
4 is our denominator because of the denominator on the fraction
20% because 9 divided by 45 is 0.2 which is 20%
The solution is the coordinates of the point of intersection
That is (3 , 1)
Its the last choice.
Uhh -1?
What’s the question?…