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Kevin plans to put concrete on a rectangular portion of his driveway the portion is 10 feet long and 3 inches high the price of concrete is 98$ per cubic yard the total cost of the concrete Kevin needs is 72.59$ which of the following is closest to the width of the portion of the driveway on which Kevin plans to put concrete

Respuesta :

twvogels
First we need to know the total volume of concrete used:
[tex]V_total = \frac{cost_{total}}{cost{unit}}[/tex]
[tex]V_total = \frac{\$72.98}{\frac{\$90}{yd^{3}}}[/tex]
[tex]V_total = 0.7407yd^{3}[/tex]

Now we can use the formula for volume of a rectangular prism:
[tex]V=lwh[/tex]
Convert everythig to yards and substitute: 
[tex]0.7407yd^{3}=(3.33yd)(w)(0.08333yd)[/tex]
[tex]w=\frac{0.7407}{3.33 \times 0.08333}[/tex]
[tex]w \aprox 2.66yd[/tex]

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