Book Maths Puzzle Interview

An object is projected upward with an initial velocity of 98ft/second. The rise and fall of the object is given by the equation s=98t-4.9t2, where s is the height above the ground and t is the time from the object's launch. Find the maximum height and the time this occurs?

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Book Other Question

Jon averages 30mph when he drives on the highway to his house and 50mph on the interstate. If both routes are the same length, and he saves 2 hours by traveling on the interstates, how far away is his house?

A farmer has 300ft of fencing and wants to enclose a rectangular area of 500ft square. What dimensions should he use? (p=2l+2w, A=l*w) Triangle MNR has vertices M (1,1), N (4,6), and R (8,4). Triangle MNR is dilated by a scale factor of 2. What are the coordinates of each vertex of the resulting triangle?