Match each product of complex numbers with its value.
pairs -6, 5 , 7 , -2
complex numbers i^2(2i^2-5) , i^2(3+ i^2) , 2i(2i- i^3) , i(4i^3-i)

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