Estimate the value of the quantity.The graph below shows the rate of natural gas usage (in therms per day) in one household for a 30-day period. Estimate the total number of therms used during this period. Use left endpoints and rectangles with widths of 3 days.

A. 159 therms
B. 147 therms
C. 136 therms
D. 165 therms


Answer: A

Mathematics

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