A roll of carpet will cover an area the size of a 12-foot by 14-foot room. How many rolls must be bought to cover a 50-foot by 70-foot restaurant dining room?

In a quadratic function of the form ax^2+bx+c, which of the following is not true? a. the y-intercept is c. b. if a is positive, the parabola opens up. c. the vertex has an x-coordinate of -b/2a. d. the axis of symmetry is the line y=-b/2a.