What is the function y=-(x+2)(x+9) in vertex form?

What is the value of f(x) = 2.2 for f(-2)?

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

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