I could be wrong but I think 28.
Where is the rest of the question?
Answer:
Area = length x width
21 = (2w-1)w
21 = 2w^2 -w
2W^2 - w -21=0
(2w-7 )(W +3)=0
2W-7=0 or w+3=0
W=7/2 or w=-3
Width cannot be negative.
So width is 7/2=3.5
Then the length is 6
2/4= 10/20
1 4/10=14/10 14/10=28/20
10/20×28/20=7/10
I hope this helped!!!:)
Answer:
B - Cylinder
Step-by-step explanation:
It has 2 bases (one on top and one at the bottom)
And It has no lateral faces