Answer:
You have to give us the other expressions :)
Step-by-step explanation:
<em>Answer:840 hours</em>
<em>Step-by-step explanation:You have to Add to get your answer.This is how I got 840:</em>
60+60=120
120+720=840
Your answer is:840 hours
hope this was helpful :)
Answer:
D
Step-by-step explanation:
I'm pretty sure it's D