
This is an exact answer. the answer will be a bit larger than 20
Answer:

Step-by-step explanation:
The complete question in the attached figure
we know that
The surface area of a cube is equal to the area of its 6 squares faces
so
The area of one square face is equal to

where
b is the length side of the square
we have

substitute
---> area of one square face
Find the surface area of three cubes
Multiply the area of one square face by 6 (one cube has 6 faces) and then multiply the result by 3 (3 cubes)
so
![SA=3[6(1)]=18\ ft^2](https://tex.z-dn.net/?f=SA%3D3%5B6%281%29%5D%3D18%5C%20ft%5E2)
Number 1 is 23-7=16
Number 3 is 19-2=17
2 Large Box=6.24
3 Small box=5.04Answer:
0.14
0.13
0.01
0.48 or -1.2
Step-by-step explanation:
Easye as pie
16 ounce is 2.24
24 ounce is 3.12
ok 2.24/16
0.14 price per ounce
for first one
now second one
3.12/24
0.13price per ounce
second one
0.14-0.13=0.01
for last question
2 large boxes=6.24 dollars
each large box=24ounces
2 boxes=48
0.13*48=6.24
6.24 dollars for 2 large boxes
3 small boxes=5.04
0.14 each ounce and 12 each small box
so 12*3=36
36*0.14
5.04
so if the smalle box had 48 ounces it would costs 6.72
2 Large Box=6.24
3 Small box=5.04
-1.2
now into the ounces
6.72-6.24
0.48