A rectangle has a width of 3 units. The rectangle's length is 5 times its width. What is the area of the rectangle?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0