Mindy took a survey of her classmates to find out the type of movie that each student likes best. Mindy decides to expand her survey to another 80 students. Based on the survey, what number of students should Mindy expect to say that they prefer documentaries?

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

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

If f(x)=-3x+2 and g(x)=-7x-2, which point represents f(x)=g(x)?