After pulling the plug from a tub the amount water in the tub changed constant r

Question

After pulling the plug from a tub the amount water in the tub changed constant rate of -1.6 gallons per minute. After draining 4 minutes, there were 40 gallons of water remaining in the tub. a. Find the change in the number of gallons in the tub when the number of minutes the tub has been draining changes from 0 minutes to 7 minutes. b. How many gallons of water in the tub before the tub began to drain? c. what a formula that determines the number of gallons in the tub, y, in terms of the number of minutes elapsed since the plug was pulled, x.

Explanation / Answer

a) it is draining at rate of -1.6 gallons per minute and after 4 minutes there is 40 gallons left

So , initial gallons before draining = 40+(4*1.6) = 46.4 gallons

( 46.4-7*1.6-46) = -1.6*7 = -11.2 gallons

b) 46.4 gallons (already calculated)

c) y = 46.4-1.6x

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