book Maths Puzzle Numerical Ability

A private airplane leaves an airport and flies due south at 192 km/h. Two hours later a jet leaves the same airport and flies due south at 960 km/h. When will the jet overtake the

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how do I simplify this equation...8+(-2)+7(-5) 1. determine the radius of the following cricle, then graph it identifying where its center is located. (x+2)2 + (y-6)2 = 81

2. find a and b, the foci and identify the major ax