Question 462043: I am begging someone to review these difficult homework problems for me. They are due by the end of today and I don't know if I did them correctly. PLEASE HELP!
Can a kind tutor please tell me if I did these difficult homework problems correctly?
7. Of the 100 people who were given a new sleeping aid, 30 experienced a light headache, 18 experienced a reduced appetite, and 60 experienced neither side-effect. How many people experienced both a light headache and a reduced appetite?
60-48 - 12?
8. A quiz consists of 6 multiple-choice questions, each has three possible answers. In how many different ways can the quiz be answered if one answer is chosen for each question?
3^6= 729?
9. A code consists of two letters chosen from the English alphabet, followed by 4 digits. If the first letter must be a K or an M, the second letter can be any one of the 26 letters, how many different codes are possible?
2 x 26= 52 x 10^4= 52,000?
10.In how many ways can two math books and three English books be arranged in a row if the two math books must be placed next to each other?
4!?
Answer by solver91311(24713)   (Show Source):
You can put this solution on YOUR website!
7. Nope. You have 60 with neither, hence there are 40 that have one, the other, or both. The number with one effect is 30 and the other is 18. The sum is 48. That is 8 more than the 40 you have available, so that must be the number of duplicates. So there are 22 with only effect 1, 10 with only effect 2, and 8 with both. 22 + 10 + 8 = 40. Answer: 8.
The rest are correct.
John
My calculator said it, I believe it, that settles it
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