(7.8 x 103) (1.0 x 104) = ?

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5