The author invokes which of the following to support his claim that smallpox's impact on European settlers was different from its impact on Native Americans? А
Pseudoscientific theories of European racial superiority
B
Evidence from population genetics
C
Ideas about the role of divine providence in human affairs
D
Protestant ideas about hard work and economic success as markers of personal virtue

  the correct answer is : binding price ceilings encourage the formation of a black market

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.