the are of a rectangle must be at least 105 square feet. if the length is 7 feet, find the minimum for the rectangle's width​

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

What is the measure of ac? enter your answer in the box. (4x - 5.5) (5x+25)

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.