Homework Help: Math

Posted by Derrick on Wednesday, March 21, 2012 at 6:58pm.

Robert and his dad want to build a sandbox for his sister's birthday.They wanted it to be 4 feet wide and have an area of 28 square feet.

What is the length of the sandbox?
7?

Robert's dad decided to make the sandbox bigger by extending the length and width of the sandbox by 24 inches. What is the area of the bigger sandbox?

When Robert and his dad finished building the sandbox,it was 2 feet tall.He wanted to fill up the sandbox with new sand.Each bag of sand cost $12 and covers 3 cubic feet. HOw much money will Robert's dad save by only fillinh the sandbox half way?

I dont know how to answer the 2nd and last question

Math - Anonymous, Thursday, March 22, 2012 at 4:01pm
2) 12in=1ft; 24in=2ft

4+2=8
7+2=9
8*9=72
Answer: 72ft^2

3)v=lwh
l=9
w=8
h=2

v=8*9*2
v=144ft^3

For # of sand bags if sandbox is completely filled:
144/3= 48
For $ used if buy it full:
48*12=576
$576
For # of sand bags if sand box is filled half way:
144/2=72
72=sand half filled
72/3=24
24 bags

For $ of sand half filled:
24*12=288
$288

Find the difference of the prices:
$576-$288= $288

Answer: Robert's dad will save $288 by only filling the sandbox half way

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