let f(t) be the number of people in millions who own cell phones t years after 1990 complete each statement by filing in the blanks to explain the meaning of the following expressions​

Np4=12np2 with clear explanation.

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 .

Maurice has 54 fewer comic books than rebecca.they have 130 comic books together .how many comic books are in maurices collection ? how many comic books are in rebeccas collection