Calculus

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I have tried calc-chat's method and I always get the answer 12 units but the answer should be 69 according to my key! What do I need to do to get there??
"Use the limit process to find the area of the region between f (x)=10x+8 and the x-axis on the interval [0,3]"

  • Calculus -

    ...please help???

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