Without actual calculation find (25)^3-(75)^3+(50)^3

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

What is the 12th term of b(n)=-4-2(n-1)