- How do i convert 80 mins to hrs and mins?

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Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? If 7.46g of CrCl3 are dissolved in enough water to make 385 mL of solution, what is the molarity of the resulting solution? Find Marginal Cost from total cost function (P^2)A(P)? Problem involving math induction! 1. Prove for every integer p, p^2 + 3p + 8 is even.? Current in a circuit increases linearly from 0 to 5A over 5 second total charge flowing through cicuit over duration is seniors plz give ans?