Please help
I need help on the first one
<span>Since a P-wave can travel anywhere between 1.5 and 8 kilometers per second, then it is all a matter of multiply those numbers by how many seconds there are in total in 9 minutes and 20 seconds. If that is the case, then a P-wave will travel at least 840 kilometers in the said time frame.</span>
Answer:
DC equals EC times AC all over BC
Explanation:
The parallel lines divide the segments proportionally, so you have ...
DC/AC = EC/BC
Multiplying by AC gives ...
DC = (EC·AC)/BC . . . . . . matches the 1st Choice