Check whether the following numbers are prime or composite 2 into 3 +5

After two years, how much has been paid into interest?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)