Answer:
there is no answer for this problem unless you use even numbers.
Step-by-step explanation:
Answer:
(5+5)x2
Step-by-step explanation:
I think this is it, as for you said a person sent 5 emails to 5 friends, so 5 so far. Then they sent 5 mails, 5+5=10. This happened 2 times so 10x2.
Answer:
about 240.8551 mm
Step-by-step explanation: