Whats the mean

8, 10, 10, 11, 16, 17, 18, 21, 41

Find the value of the cosine for angle a

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

The paint recipe also calls for 1/4 cup of food coloring. tyler says mrs. mcglashan will also need 6 cups of food coloring. do u agree or disagree? explain.