Ross is shopping for mulch that costs $1.29 per cubic foot. during his first trip to the store, he bought 16.5 cubic feet. he needs another 4.5 cubic feet to complete his landscaping project. which expression shows the total cost in dollars of the mulch?

Cost Expression 1.29 X 21

Step-by-step explanation:

Given, Ross is shopping for mulch that costs $1.29/cubic foot.

He bought during his first trip =16.5 cubic feet

And, he needs another cubic feet to complete his landscaping project  which is 4.5 cubic feet.

Now, we will have to find the expression which shows total cost in dollars of the mulch.

Given information,

Cost of 1 cubic foot =$1.29

And the total number of cubic feet he bought=16. 5

Extra cubic feet needed=4.5

Now,

Total cubic feet he bought=4.5+16.5=21 cubic feet

Hence, Total cost = 1.29 X 21

the total cost is $27.09