How do you do this problem? 24-4 to the second power ×3+15

Acircle has a circumference of 28.36 units what is the diameter of the circle

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

Me n o w. i need t h i s. 10 points