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

x² + 2x - 6

Step-by-step explanation:

The notation (f+g)(x) means to add each equation.

(f+g)(x) = 2x + 1 + x² - 7 = x² + 2x - 6

Simplify the expression by combining like terms like 1 - 7 = -6. 2x and x² are not like terms since they have different exponents on the base.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)