Answer: y=6
Step-by-step explanation:
The given number is y.
According to the question,
Step 1 . subtracts three from the number (y-3), then doubles it
i.e. Final number = 2(y-3)
Step 2 . subtracts three again i.e. (2(y-3)-3), and doubles the number again
i.e. Final result = 2(2(y-3)-3)
If the result is his original number y, then
2(2(y-3)-3) =y
⇒ 2(2y-6-3)=y [ using distributive property]
⇒ 2(2y-9)=y
⇒ 2(2y)-2(9)=y [ using distributive property]
⇒ 4y -18=y
⇒ 4y -y= 18
⇒ 3y= 18
⇒ y= 6 [Divide both sides by 3]
Hence, y=6
A. this is not a function because x=1 has 2 outputs So does x=3
B . f(120) = 20 + 10*120 = 1220
This is the cost in dollars of renting a boat for 120 hours.
<u>Answer and explanation:</u>
A) Yes, this sample is most likely to be biased.
B) If the chef is only going to survey the food critics and not the random customers that visit the restaurant, this results of the survey will be biased.
The reason being that there will exist a systematic error since the surveyed people will not cover the whole population as it will only be limited to the food critics.
