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Find an equation for the linear function which has slope -10 and x-intercept -7

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work