- Is it normal to get tired after being awake for 7 hours?

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Questions for medicine I could not get it and I need your help? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? 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? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? Name a class of annelids whose members may have protonephridia?