Find the value of x, given that m∠R = 4x + 39

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?

Nine more than four times a number is the same as one less than twice the number. find the number?

Solve the triangle. a = 21°, c = 105°, c = 5