Answer:
5 5/6
Step-by-step explanation:
The answer would be 32 because when you plug in the value for m, it becomes 8(12/3) then divide the 12 by 3, then multiply 8 by 4.
x + 8x = 9x
(like 1 + 8 but with x's)
Answer:
Minimum dimensions are r=3cm, h=9cm
Minimum Cost=$254.47
Step-by-step explanation:
Volume of a Cylinder=πr²h
Volume of the Open Top Cylinder=81π cm³.
Therefore:
πr²h=81π
The bottom costs $3 per cm² and the side costs $1 per cm².
Total Surface Area of the open top Cylinder= πr²+2πrh
Cost, C=3πr²+2πrh
As the Volume is fixed.
πr²h=81π
r²h=81
h=81/r²
Modifying C,


We differentiate C with respect to r
C'=
At the minimum cost, C'=0.
Next we solve C'=0 for r

6πr³-162π=0
6πr³=162π
r³=27
r=3
The dimensions of the cylinder at minimum cost are therefore:
r=3 cm
h=81/9=9cm
The minimum cost of the Cylinder
C=3πr²+2πrh
=(3XπX3²)+(2XπX3X9)
=$254.47
Easy here OK so what you do is multiply 2 times 6 and it is 12 then do 2 times 12 which is 24 so Tanya is 24 hope I helped!