Washington repeats the phrase "one-third” in the eighth paragraph primarily to Nearly sixteen millions of hands will aid you in pulling the load upward, or they will pull you against the load downward. We shall constitute one-third and more of the ignorance and crime of the South, or one-third its intelligence and progress; we shall contribute one-third to the business and industrial prosperity of the South, or we shall prove a veritable body of death, stagnating, depressing, r*t*rding every effort to advance the body politic.

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.

Geographic information system
global positioning system
one has the word information, the other has the word positioning