3+ means 3 and up hope i could help.
Helloooo, Your answer for part A is 13 cm
You answer for part b is 2600
13 x 10 x 20 = 2600
California is at higher risks for earthquakes, because it near the Pacific Ocean
I honestly don’t know I’m just trying to get my question answered
11.5 beause you take the average of 12 and 11
