Richard estimates that he can apply fertilizer to 4,486 square feet of grass in 3/4 hour. How many square feet of grass can Richard fertilize per hour?

At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.

What expression is equivalent to 42x-56y

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)