Would side lengths 5,7, and 10 form a triangle?

Which value is not a solution of 8x^3 – 1 = 0

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!