True or False

17. x nickels, y dimes, and z quarters are worth 5x + 10y + 25x dollars. 18. The line y = x intersects the circle a2 + y? = 1 at two points. 19. The point (1, 3) satisfies the inequality y>x+2. 20. To solve a linear programming problem, we evaluate the objective function at the vertices of the region determined by the constraints. 21. The number of ways to choose three questions to answer out of five questions on an essay test is C(5, 2). 22. The binomial expansion for (x + y)" contains n terms