Answer:
The dimension of box=
Step-by-step explanation:
We are given that
Volume of box=4 cubic feet
Let x be the side of square base and h be the height of box
Volume of box=


Now, surface area of box,A=








Substitute x=2

Hence, the area of box is minimum at x=2
Therefore, side of square base,x=2 ft
Height of box,h=
Hence, the dimension of box=
Answer:
c
Step-by-step explanation:
because are of trapizium =( a+b/2) × h
Answer:
2
Step-by-step explanation:
It will be 20*21 based on the pattern in the chart
Answer:
3
Step-by-step explanation: