If f(x)=4x^2+1 and g(x)=x^2-5, find (f-g)(x)

a. 5x^2-6
b. 3x^2+6
c. 3x^2-4
d. 5x^2-4

How do you find principle and simple interest

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?