HELP QUICK, 30 PTS, WILL MARK BRAINLIEST ,find the number for september

Which of the following graphs represents the function f(x) = 2^x

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

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