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Find the complement of the angle 3pi/7. Please show steps!? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Problem involving math induction! If m and n are distinct real numbers, prove that (m+2)^2 = (n+2)^2 if and only if x+y=-4?