Kendra is stacking boxes of tissues for a store display. She stacks 3 boxes in the first minute, 6 boxes by the end of the second minute, and 9 boxes by the end of the third minute. Suppose the pattern continues for parts a-d.
a. How many boxes will Kendra have stacked by the end of the fourth minute?
12 boxes
b. How many boxes will Kendra have stacked by the end of the fifth minute?
15 boxes
c. How many boxes will Kendra have stacked by the end of the sixth minute?
18 boxes
d. How many boxes will Kendra have stacked by the end of the tenth minute?
30 boxes