Anna h. its me the guy from zom. i forgot your roblx user.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

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

What is the remainder when 3x^2-x-10 is divided by x-1 -6,-7,-8, or -9