Answer:
30
Step-by-step explanation:
boys: girls : total
3 7 3+7 =10
The total number of students must be a multiple of 10
The class size is between 22 and 34
The only multiple of 10 between those numbers is 30
10,20,<u>30</u>,40
Therefor the class size must be 30
Answer:

Rounded to the nearest hundredths: 11.69.
Step-by-step explanation:
I would use the Pythagorean theorem for this problem.
The difference between the highest point and the lowest point of AD is 9.8-7.2 = 2.6, so that would be the height of the triangle. The length/base of the triangle would be 11.4.
Now, just solve using Pythagorean's theorem:

Rounded to the nearest hundredths: 11.69.
I hope this helped you.
Answer: 0.7887
Step-by-step explanation:
Let x be the random variable that represents the diameters of the corks .
Given : The first produces corks with diameters that are normally distributed with mean 3 cm and standard deviation 0.08 cm.
i.e. 
Acceptable corks have diameters between 2.9 cm and 3.1 cm.
Then, the probability that the first machine produces an acceptable cork will be :_

∴ The probability that the first machine produces an acceptable cork= 0.7887
Answer:
y=-x+2
Step-by-step explanation:
y-(-1)=-1(x-3)
y+1=-1x+3
y=-1x+3-1
y=-1x+2
1 kg is 1,000 grams.
200 grams are 1/5 of 1000 grams, that is 1/5 of 1 kg.
Thus 200 g= 1/5 kg = 0.2 kg.
1 kg of cheese is <span>$4.40,
</span>
so 0.2 kg of cheese is

Answer: $0.88