I think the answer is 2,612.48 because if you multiply the radius, 80 by itself you get 640. Then if you multiply 640 by 3.14 and then multiply the product by 1.3 you get 2,612.48.
Answer:
a = 19
Step-by-step explanation:
Given the equation of:

First, multiply both sides by 3. That will clear the denominator which makes it easier to solve for a variable:

Subtract both sides by 5 to isolate the variable:

Therefore, the value of a is 19.
I’m pretty sure it’s 18x +24