Why doesn't the tutor work?? also this is a question because there's only one tutor and its mathematics and doesn't work for some reason

How far could you drive on 50 gallons of gas

If you can solve all of these i will give ! - 4% of 190 - 4% of 162.5 - 4% of 140 - a 4% increase from 155.1 - a 4% increase from 159.8

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0