Your proportion should look something like this

After cross multiplication, you should end up with this equation

After dividing 4 on both sides, you should get that x=9
What is your question this makes no sense
Answer:
Right answer is B) x>-10 and x<10
ANSWER: 3.3370212766 all you do is put it in a calculator
Answer:
B. experimental probability
Step-by-step explanation:
It wasn't A because the coin was flipped making it an experiment.
Option C is just wrong.
So that leaves you with option B as your answer.
Hope this helps.