That's 21.
Hope this helps !
Nyway
First off, the formula for finding the volume of a cylinder is: V=pi × radius² × height
So, because the diameter is 8 inches, to find radius, we just divide by 2 so R=8÷2=4. The radius is 4 inches.
Then because it said that the height is 3 times the radius, 3×4=12. The height is 12 inches.
Now, we can plug in our information and use the formula to find the volume (V=pi × r² × h) :
V= 3.14×4²×12
=3.14×16×12
=608.88 cubic cm ( it can also be written 608.88 cm³)
And there you have the volume. (If this is wrong, then I apologize. I'm pretty sure it's correct tho. If it is wrong, I'll be happy to try to solve it again for you.)
We are given to check
whether these numbers are proportional
we know that any set of numbers are proportional when their ratios are equal
so, firstly we will ratios
First set of numbers:
We are given first set of numbers as 15 , 20 and 30
so, it's ratio is
now, we can simplify it
Since, common factor is 5
so, we can cancel 5
and we get
Second set of numbers:
We are given first set of numbers as 24 , 32 and 48
so, it's ratio is
now, we can simplify it
Since, common factor is 8
so, we can cancel 8
and we get
We can see that both sets of numbers are having same ratios
so, they are proportional.........Answer
Answer:
1 st expression is used in this
The answer in b next time make sure the picture is clear