exam Maths Puzzle Numerical Ability

Solve the Inequality. Graph the solution set and write the solution set in the interval notiation. --> (a+5)(a-5)(a-7)>0

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exam Other Question

Which quadrant will the area be if x > 0 and y < 0? Can the area be shifted to a different quadrant simply by using additional inequalities? Why?

I cannot understand the question. Kindly help me. Thank you for helping me out Two planes are 2100 miles apart and traveling towards each other. One plane is traveling 80 mi/hr. faster than the other plane. The planes meet in 2.5 hr. Find the speed of the slower plane.