1. Which of the following is an element of both the set of positive odd integers and the set of prime numbers?A. 2B. 5C. 9D. 12E. 21 2. For 12 bottles of shampoo of various brands , the cost an volume of each are displayed in the scatterplot above,

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1.Whichofthefollowingisanelementofboththesetofpositiveoddintegersandthesetofprimenumbers?A.2B.5C.9D.

1. Which of the following is an element of both the set of positive odd integers and the set of prime numbers?A. 2B. 5C. 9D. 12E. 21 2. For 12 bottles of shampoo of various brands , the cost an volume of each are displayed in the scatterplot above,
1. Which of the following is an element of both the set of positive odd integers and the set of prime numbers?
A. 2
B. 5
C. 9
D. 12
E. 21 
 
 
2.

 
For 12 bottles of shampoo of various brands , the cost an volume of each are displayed in the scatterplot above, and the line of best fit for the data is shown. Of the following , which is closet to the average (arithmetic mean ) cost per ounce for the 12 bottles?
A $0.06
B $0.09
C $0.12
D $0.15
E $0.18
 
为神马!

1. Which of the following is an element of both the set of positive odd integers and the set of prime numbers?A. 2B. 5C. 9D. 12E. 21 2. For 12 bottles of shampoo of various brands , the cost an volume of each are displayed in the scatterplot above,
1.positive odd integers 表示奇整数,prime numbers表示质数.五个选项里面只有5是质数
2.第二个题我没算.但是大概的做法应该是先确定12个点的cost和volume(用尺子比着图片找坐标),然后求均值.然后看12个里面哪个与均值最接近
(我在电脑上不好描点)

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