Use an equation to model the sentence. How many raisins are left in a jar of 55 raisins after you have eaten some?

Is it

R=55-N
R=55+N
R=55/N
or
R=N/55

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

What is the perimeter of a rectangle if the length is 5 and the width is x?

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.