91. Revenue The revenue R received by a company selling r pairs of sunglasses per week is given by
the function R(x) = -0.1.x2 + 70x.
(a) Find and interpret the values of R(17) and R(25).
(b) How many pairs of sunglasses must be
sold in order for revenue to be $10,000 per
week?
(c) How many pairs of sunglasses must be sold in
order for revenue to be $12,250 per week?

Look at this system of equations. -3x + 3y = 12 y = x + 4 the solution set of this system is best explained by which of these statements? a) the graphs of the equations are the same line because the equations have the same slope and the same y-intercept. the system has infinitely many solutions. b) the graphs of the equations are parallel lines because they have the same slope but different y-intercepts. the system has no solution. c) the graphs of the equations are lines that intersect at one point because the equations have the same slope but different y-intercepts. the system has exactly one solution. d) the graphs of the equations are lines that intersect at one point because the equations have the same slope and the same y-intercept. the system has exactly one solution.