Im confused, my question is how do you work out this question:

what do you add to 2 1/7 to make 4?

Which polynomial function has x intercepts -1, 0, and 2 and passes through the point (1, -6)

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

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