Vertical angles are equal and supplementary angles add to 180 degrees
-14.5
Basically, -(7.5+4) is -11.5 and then combine -3 with -11.5 which yields -14.5
The discriminant is the part of the quadratic formula underneath the square root symbol: b²-4ac. The discriminant tells us whether there are two solutions, one solution, or no solutions.
5.250
To change a fraction to a decimal fraction divide the numerator by the denominator.
that is 21 ÷ 4 = 5.250 ( to 3 decimal places )