Find the 8th 15th 50th and a formula for the nth term of these Arithmetic progression
a.3,7,11...
b.-5,-3 1/2,-2...
c.1/2,5/6,1 1/6,...

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 .

Can someone tell me if this is perpendicular? !

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.