Step-by-step explanation:
Since there is 2 unknown variable ,
so we need 2 equation to find their values.
Answer is <span>C) 1/20 of a foot
1/4 -1/5
= 5/20 - 4/20
=1/20</span>
C=8πab
Divide both sides by 8πb
c/(8πb) = a
Answer:
0.0000805
Step-by-step explanation:

= 0.0000805