Discover Questions

7^(x+1) + 7^x + 7^(x-1) = 399, what is x? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Find Marginal Cost from total cost function (P^2)A(P)? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? Diameter of a wheel 80cm. If the wheel rotates through an angle of 200degrees, how many cm does it move? Show steps please!?