SOLUTION: Use the 5 steps for problem solving to answer the following question The volume of a rectangular slab of concrete need to exceed 72 cu. ft. If the length is 12 ft. ad the width

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Question 621059: Use the 5 steps for problem solving to answer the following question
The volume of a rectangular slab of concrete need to exceed 72 cu. ft. If the length is 12 ft. ad the width is 8 ft. how thick does the concrete slab need to be?
Does anyone have the time to help me out o this....PLEASE
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
Those "5 steps for problem solving" are a mystery to me.
I solve problems my own way, using my own reasoning and not a pre-set recipe.
I believe that using recipes is the wrong way to teach math.

The volume of a rectangular right prism can be calculated as
Volume = length X width X height
If the volume (V, in cubic feet) has to be at least 72 cubic feet, and the height (or thickness) of the slab is x feet,
V%3E=72 and V=12%2A8%2Ax can be combined to get
12%2A8%2Ax%3E=72 --> x%3E=72%2F8%2F12 --> x%3E=3%2F4
So the concrete slab should be at least 3/4 of a foot (9 inches) thick.