x/20 = 21/14 (similar proportions)
x/20 = 3/2 (simplify by canceling out a factor of 7)
x = 30
Answer:
≈ 14.3 hours
Step-by-step explanation:
The mean is calculated as
mean = 
= 
= 
≈ 14.3 ( to nearest tenth )
A.)
x y
1 1
2 4
3 9
dx=2-1→dx=1 dy=4-1→dy=3
dx=3-2→dx=1 dy=9-4→dy=5 different to 3, then this table can not be represented by a line
B.)
x y
1 2
2 5
3 10
dx=2-1→dx=1 dy=5-2→dy=3
dx=3-2→dx=1 dy=10-5→dy=5 different to 3, then this table can not be represented by a line
C.)
x y
1 3
2 6
3 9
dx=2-1→dx=1 dy=6-3→dy=3
dx=3-2→dx=1 dy=9-6→dy=3, then this table can be represented by a line
D.)
x y
1 0
2 3
3 8
dx=2-1→dx=1 dy=3-0→dy=3
dx=3-2→dx=1 dy=8-3→dy=5 different to 3, then this table can not be represented by a line
Answer: Option C. x 1 2 3 y 3 6 9
In this question, each star equal to 4 students. If the people on 85 and 90 take the test again that means their number should be 14+4 people= 18 people.
If they all get 95, then it means we need to add 18 people to the 95 graph. The number of stars would be: 18 people / (4people/stars)= 4.5 stars
If you add the stars graph it will be easier. It should be clear that 85 will have 1 stars and 90 have 3.5 stars. Adding them up will be 1 stars + 3.5 stars= 4.5 stars
The error that the student made was that he forgot to square.
<h3>How to Convert From Square Meter to Square Feet?</h3>
The conversion rate of converting meter to feet (linear measurement) is given as:
1 meter = 3.28 feet.
The measures given is in area, therefore, we would need to square when doing our conversion. To convert 3.5 square meter to square feet, do the following:
3.5 m² × (3.28 ft/1 m)² (this is where the student made an error by omitting or forgetting to square)
= 3.5 × 10.8
= 37.8 square feet
Therefore, we can conclude that the error that the student made was that he forgot to square.
Learn more about Converting From Square Meter to Square Feet on:
brainly.com/question/17064816
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