Hello :) how to do (bii)?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

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