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stealth61 [152]
3 years ago
6

Day middle school has 24 students from the 8th grade that are in band. This is 25% of all the students in 8th grade. How many st

udents are there total in 8th grade
Mathematics
1 answer:
Volgvan3 years ago
6 0

Answer:

96 in 8th grade

Step-by-step explanation:

You times 24 by four to get 96. Then to check your answer you need to do 25%96 and you will get 24 to show that you are right.

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In an experiment to measure the effect of fluoride "varnish" on the incidence of tooth cavities, 34
EleoNora [17]

Answer:

Option a is right

a) Since the subjects were not randomly selected for the study, we cannot conclude that a reduction in cavities can be attributed to the fluoride treatment.

Step-by-step explanation:

Given that in an experiment to measure the effect of fluoride "varnish" on the incidence of tooth cavities, 34  10-year-old-girls whose parents volunteered them for the study were raOne group was given fluoride varnish annually for 4 years along with a standard dental hygiene regimen;

the other group only followed the standard dental hygiene regimen.

The mean number of cavities in the two groups was compared at the end of the treatments. ndomly assigned to two groups.

Because they have selected 34 volunteers, the sample is not selected at random.  This is biased one.  Also sample size is very small compared to 10 year old girls in the world.

a) Since the subjects were not randomly selected for the study, we cannot conclude that a reduction in cavities can be attributed to the fluoride treatment.

is the right answer

6 0
3 years ago
Can someone please help me with this math problem please:):)
Morgarella [4.7K]

Answer:

y = 126° + 29° = 155°

5 0
3 years ago
Read 2 more answers
jake scored 2 goals in soccer this season. jamie scored 2 times as many golas as jake. edgar scored 3 times as many as jamie.how
Hatshy [7]
Jamie scores 4 and 3 times that is 16
6 0
2 years ago
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Can you answer this for me plssss 0.5(r+2.75)=3
lora16 [44]

Step-by-step explanation:

0.5 ( r + 2.75 ) = 3

r + 2.75 = 3 / 0.5

r + 2.75 = 6

r = 6 - 2.75

r = 3.25

4 0
3 years ago
Read 2 more answers
Solve for x<br> x + y = 1<br> x + 7y = -4<br> 2x - 6y = 4<br> 5x + 15y = -10<br> 2x + 6y = 10
Arada [10]
X + y = 1
add - y both sides
x + y +  - y = 1 +  - y
x =  - y + 1
Answer: x =  - y + 1
Graph: y =  - x + 1


x + 7y =  - 4
add - 7 both sides
x + 7y +   - 7y = - 4 +  -7y
x =  - 7y  - 4
Answer: x = - 7y   - 4
Graph: y = 0.142857x  -  0.571429


2x  - 6y = 4
add 6y to both sides
2x  - 6y + 6y = 4 + 6y
2x = 6y + 4
divide both sides by 2
2x/2 = 6y + 4/2
x = 3y + 2
Answer: x = 3y + 2
Graph: y = 0.333333x  -  0.666667



5x + 15y = - 10
add - 15 to both sides
5x + 15y +   - 15y = - 10 +  - 15y
5x = - 15y  - 10
divide both sides by 5
5x/5 =  - 15y - 10/5
x = - 3y  - 2
Answer: x = - 3y - 2
Graph: y =  - 0.333333x  -  0.666667



2x + 6y = 10
add - 6y to both sides
2x + 6y +  - 6y = 10 +  - 6y
2x =  - 6y + 10
divide both sides by 2
2x/2 = - 6y + 10/2
x =  - 3y + 5
Answer: x =  -3y + 5
Graph: y =  - 0.333333x  +  1.666667





Hope that helps!!!
8 0
3 years ago
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