Astudent has some $1 bills and $5 bills in his wallet. he has a total of 15 bills that are worth $47. how many of each type of bill does he have. (using algebra, substitution to solve a problem)

15/16 as a decimal rounded to the nearest hundredth

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)