A truck whose bed is 2.5 m long, 1.5 m wide, and 1.0 m high is delivering sand for a sand-sculpture competition. About how many trips must the truck make to deliver 7 m³ of sand?

2 trips

Explanation:

From these measurements provided the bed of the truck would be a Rectangular Prism. In order to calculate how much sand the bed can hold we need to find its volume which is calculated by multiplying the length, width, and height together.

V = 2.5m * 1.5m * 1.0m

V = 3.75

Now that we know how much the bed can hold we divide the total amount of sand that needs to be delivered by the amount the truck bed can hold to calculate the minimum number of trips that the truck needs to make

7 / 3.75  = 1.86 trips

Since the number of trips can't be a decimal we need to round this number up to which would make it a total of 2 trips.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.