Math help

9). Hooke’s Law. The distance d when a spring is stretched by a hanging object varies directly as the weight w of the object. If the distance is 29 cm when the weight is 4 kg what is the distance when the weight is 9 kg?
10). Find the variation constant and an equation of variation where y varies inversely as x and y =9 when x= 17?
11). It takes 8hr for 9 cooks to prepare the food for a wedding rehearsal dinner. How long will it take 3 cook to prepare the dinner? Also what variation applies Inverse or Direct?
12). The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r. If a car traveling 80 mph can stop in 360ft, how many feet will it take the same car to stop at a speed of 70?

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1. 9 find k. k=4kg/29cm

distance=4/29 * 9 I am very disturbed by the questions statement that kilograms is weight. It is not weight, it is mass.
10 y=k/x put in x,y and solve for k.

11 time=cook/rate=3/(9/8hr)

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