A store sells juice in different sizes. Determine which size is the best buy and the unit price. 8 oz $2.40
24 oz $6.48
64 oz $14.08

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)

Charlie tosses five coins.what is the probability that all five coins will land tails up.