Answer:
78 emails
Step-by-step explanation:
Given
Represent sent emails with x and received with y.
So, we have:
-- First statement
-- Second statement
Required
Determine the number of emails received (y)
Make x the subject in 

Substitute 114 - y for x in 

Open bracket

Collect Like Terms


Divide by 3


Answer:
A
Step-by-step explanation:
Find the common factors between the 2:
2πr + 4πrh
2 (πr+2πrh)
2πr (1 + 2h)
Answer: 4/3
Step-by-step explanation: 4 / 3 = 4/3