Assume there are 200 mendaliens living on an island in my back yard. if my island has an area of 20 hectares, what is the population density of mendaliens in terms of mendaliens per hectare?

Which expression is equivalent to 3^3 + 2^2?

4+(2+x) can you me solve this problem

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