Question

I need help with 2-5

Answer 1

#2:  First find the volume of the slab.  Next, mult. that vol. by the unit cost of concrete:

Volume of slab = length * width * thickness = (11 ft)(11 ft)(0.25 ft) = 121/4 ft^3.

Convert this into cubic yards:
    
121 ft^3      1 yd^3
------------ * ----------- = 1.12 yd^3
      4           27 ft^3

Then the cost of the concrete will be 


1.12 yd^3       $63
-------------- * -------------- = $70.58
       1             1 yd^3