Answer:
a and c I think if I'm wrong I will try again
Answer:
shoulda woulda coulda been B
Step-by-step explanation:
Answer:

Kelly is correct.
Step-by-step explanation:
One person is able to plant 4 trees
Let x be the number of people
y be the number of trees
The situation is represented by

5 people are able to plant 20 trees

So, the situation is represented by 
Hence, Kelly is correct.
Answer:
18
Step-by-step explanation:
6*2=12
9*2=18
Two laps per minute