What is the value of the geometric sequence for which a1=10 and r=0.5?

What is the 12th term of b(n)=-4-2(n-1)

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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 .