exam Maths Puzzle Numerical Ability

If a line is horizontal, what type of slope does it have?

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exam Other Question

the problem is area of a trapezoid solve b1 a=1/2h(b1+b2) Factor the polynomial completely.

I have factored other polynomials, but this one confuses me. The equation is...

-3s^2-10s+8

Thank you very much for your time!