Look up the equation for it
Answer:
1/7
Step-by-step explanation:
Since we do not know the number let us use the alphabet A to represent the unknown number
A × 1/3= 1/21
A/3= 1/21
Cross multiply both sides
A×21= 3×1
21A= 3
Divide both sides by the coefficient of A which is 21
21A/21=3/21
A=1/7
Hence the unknown number is 1/7
MMMLXXXIX
~ hope this helps!
Answer:
Formula for an opened end of a cylinder =

Closed at both end =

Opened at both end =

Step-by-step explanation: