If y varies directly as x, what is the value of y in these ordered pairs (4,16) and (2,y)

Which expression is equivalent to? assume x > 0 and y > 0.

Orly uses 2 cups of raisins for every 12 cups of trail mix she makes. how many cups of trail mix will she make if she uses 8 cups of raisins?

The polynomial 10x3 + 35x2 - 4x - 14 is factored by grouping. 10x3 + 35x2 - 4x - 14 5x )-20 what is the common factor that is missing from both sets of parentheses?