What is equivalent to -8z+ (-3.5) +1.5z+3y-5.5

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct