PLEASE HELP, ITS URGENT!​ which algebraic expression has a term with a coefficient of 3?
A. 3y + 1
B. 5y - 7
C. -2y + 5+ 3
D. 3(y-6)

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations