Would this be quadratic equations or quadratic functions?

The tangent of an angle is not which of the following? a) ratiob) proportionc) fractiond) opposite over adjacent

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Last week , donnell practiced the piano 3 hours longer than marcus . together, marcus and donnell practiced the piano 11 hours . for how many hours did each young man practiced the piano