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 don't know how to answer the 2nd and last question

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

To find the length of the sandbox, we can use the formula for the area of a rectangle: A = length × width. In this case, the area is given as 28 square feet and the width is given as 4 feet. Plugging these values into the formula, we get:

28 = length × 4

To solve for length, we divide both sides of the equation by 4:

length = 28 ÷ 4

So, the length of the sandbox is 7 feet.

Moving on to the second question, we are asked to find the area of the bigger sandbox after extending its length and width by 24 inches. To do this, we need to convert the 24 inches to feet. Since there are 12 inches in a foot, we divide 24 by 12:

24 inches ÷ 12 = 2 feet

Now, we add 2 feet to both the length and width of the original sandbox to get the dimensions of the bigger sandbox. The new dimensions are:

Width = 4 feet + 2 feet = 6 feet
Length = 7 feet + 2 feet = 9 feet

To find the area, we multiply the width by the length:

Area = 6 feet × 9 feet = 54 square feet

Therefore, the area of the bigger sandbox is 54 square feet.

Finally, for the last question, we need to calculate how much money Robert's dad will save by only filling the sandbox halfway. We know that the sandbox is 2 feet tall and its dimensions are 6 feet in width and 9 feet in length.

First, we need to find the volume of the sandbox by multiplying the width by the length and the height:

Volume = 6 feet × 9 feet × 2 feet = 108 cubic feet

Next, we need to determine how many bags of sand are needed to completely fill the sandbox. Since each bag covers 3 cubic feet, we divide the volume of the sandbox by 3:

Bags of sand = 108 cubic feet ÷ 3 cubic feet per bag = 36 bags

If Robert's dad only wants to fill the sandbox half-way, we divide the number of bags needed by 2:

Bags of sand for half the sandbox = 36 bags ÷ 2 = 18 bags

Finally, we multiply the number of bags for half the sandbox by the cost of each bag ($12) to find the total cost:

Cost = 18 bags × $12 per bag = $216

Therefore, Robert's dad will save $216 by only filling the sandbox halfway.