The time, in minutes, that it takes Mark to bake cookies is given by t = 15 + 10d, where d is dozens of cookies. How long would it take Mark to bake 48 cookies?

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Sheila wants to bake six muffins but the recipe is for 12 muffins . this means you only need half of the ingredients listed how much of the of each ingredient does she need? one cup and banana chips ,7 tablespoons oil , two eggs, 3/4 cups flour 1/4 cup walnuts show all you work and justify your answer using a baby toulmin.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b