Which change in land use resulted from the industrialization of agriculture?

A) A change in the crop-rotation cycle to allow for planting multiple crops each season
B) A concentration of primary and secondary agricultural activities on the same land
C) An increase in the practice of leaving land fallow to avoid soil depletion
D) An increase in the use of land to produce non-grain food crops
E) A shift toward the use of land in areas with ample rainfall to decrease irrigation costs

You need to figure out at which x-value does the graph has a tangent line slope of -1.remember, the derivative is the slope of the tangent line. so find the derivative function and set it to equal -1 to find the x-value that will have a tangent line slope of 0.differentiate with the chain rule.    set the derivative to equal -1 and solve for x.      take log base 10 of both sides. also recall that  .    so the x-coord of the point of tangency is .the y-coordinate of this point of tangency can be calculated using the original function:     using point-slope form, the equation of the tangent line is      the x-intercept of this tangent line is when the graph is at y=0.    this rounds off to  .choice c.

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