Given a = {a, e, i, o, u} and b = {a, l, g, e, b, r}, find a ∪ b.

(a ) - {}
(b) - {a, e}
(c ) - {a, b, e, g, i, l, o, r, u}

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