(Modeling) Solve the problem.
Water in a Tank The graph shows the number of gallons of water y in a 100-gallon tank after x minutes have elapsed.
(a) Is water entering or leaving the tank? How much water is in the tank after 3 minutes?
(b) Find the x- and y-intercepts. Interpret their meanings.
(c) Find the slope–intercept form of the equation of the line. Interpret the slope.
(d) Estimate the x-coordinate of the point (x, 50) that lies on the line.
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