Number of Gallons Used graph shows a proportional relationship between the number of hours a factory is in operation and the number of gallons of water d. Factory Water Use 000'0 1 2 3 4 5 6 7 8 9 10 Hours in Operation True or False for each statement about the graph. True False The factory uses 4 gallons of water when it is in operation for 4000 hours. int W represents the number of gallons of water used when the factory is in operation for 7 hours. The factory uses 9000 gallons of water when it is in operation for 9 hours.

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Riemann Sum

Riemann Sums is a special type of approximation of the area under a curve by dividing it into multiple simple shapes like rectangles or trapezoids and is used in integrals when finite sums are involved. Figuring out the area of a curve is complex hence this method makes it simple. Usually, we take the help of different integration methods for this purpose. This is one of the major parts of integral calculus. 

Riemann Integral

Bernhard Riemann's integral was the first systematic description of the integral of a function on an interval in the branch of mathematics known as real analysis.