I assumed that the unit of measure is ft.
Front+back:
S1=2×(4×3.5/2)=4×3.5=14ft²
2 sides+base:
S2=3×(9×4)=9×12=108ft²
Total area: 14+108=122ft²
Answer:
30+31+32 =93. Smallest is 30
The hemisphere is half the volume of a sphere. Since we are given the circumference, we can solve for the radius of the sphere. That is
Part A
We can now compute for the volume of the hemisphere.
Part B
We just need to convert the volume into its corresponding gallons
28ft because you would have to find the perimeter