Hudson and Montoya Coal Company Inc. has an electrostatic precipitator that is no longer functioning properly. If it is not fixed which law are they in danger of violating? Which act is it?

A. Superfund act
b. Nuclear Waste policy act
c. Clean air act
d. Clean water act

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

Ibelieve it is d but i may be wrong

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.