How many terms are there in a geometric series if the first term is 4, the common ration is 3 and the sum of the series is 160

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

In δabc, m∠acb = 90°, cd ⊥ ab and m∠acd = 45°. find: a find cd, if bc = 3 in

What is the answer to the question 5x+2x