21 less than a number, multiplied by 4, results in 108.find the value of the unknown number.

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

Ten times the square of a non-zero number is eqaul to ninety times the number

What is 1/3x5 on anuber line what does it look like on a number line