Answer:
I think D
Step-by-step explanation:
Because an experiment is defined as a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact. This example is testing to see if the mouthwash is effective.
I'm pretty sure it's D, sorry if I'm wrong
38
32 minus 3x4 which is 12
and you get 20
add 18
and you get 38
