Answer:
Step-by-step explanation:
C = πd. An equivalent formula is C = 2πr.
Solving the first equation for π, we get π = C/d. Solving the second equation for r, we get π = C / (2r)
Answer: 
Step-by-step explanation:
three-fifths of a number means multiply three-fifths by a variable 
increased by 10 means addition +10
together it is 
Answer:
7
Step-by-step explanation:
The answer is
a) 11/15
b) 1/18