Answer:
0.0001% probability that a randomly selected person in the United States will be struck by lightning this year
Step-by-step explanation:
A probability is the number of desired outcomes divided by the number of total outcomes.
Desired outcomes:
304 hit by lightning, so 
Total outcomes:
300,000,000 total people, so 
Probability:

0.0001% probability that a randomly selected person in the United States will be struck by lightning this year
Answer:
20% decrease
Step-by-step explanation:
2516/3270 = 0.8 or 80%
This means 80% percent of people showed up again from last year
100-80 = 20
So 20% decrease
Answer:
First step=13x+7x=18+42
Step-by-step explanation:
13x-42=18-7x
First step
It is to collect like terms of the equation
13x+7x=18+42
20x=60
x=60/20
x=3