# Question #064a7

##### 2 Answers

#### Explanation:

*"The concrete slab will be 12 feet 9 inches long, 9 feet 3 inches wide, and 3 inches thick"*

**Laying out the information**

*12 feet 9 inches*is#(12\cdot12)+9# since each foot is 12 inches. This gets you#144+9=153# inches for your length.*9 feet 3 inches*is#(9\cdot12)+3# for the same reason. This gets you#108+3=111# inches for your width.- Your height (thickness of slab) is
#3# inches.

**Summarizing:**

Now find the volume of the slab by using the formula

#l\cdotw\cdoth# , or#153xx111xx3=50949# cubic inches.

**Converting**

But the weight is 150 pounds per *cubic foot*, so you have to turn the inches into feet. Again, since each foot is 12 inches:

**Final steps**

Now to solve for weight, multiply the cubic feet weight by 150 to get your answer.

We will need to find the volume of the slab in cubic feet (

Then:

Now:

The weight of the slab is then: