Multiply 3 by b, then multiply c by the result

Select the correct answer from each drop-down menu. the length of a rectangle is 5 inches more than its width. the area of the rectangle is 50 square inches. the quadratic equation that represents this situation is the length of the rectangle is inches.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

If the value of cos330°is√3/2 then find cos 165°.