Answer:
2
Step-by-step explanation:
r(x) = 2 sqrt(x)
s(x) = sqrt(x)
r(x) / s(x) = 2 sqrt(x) / sqrt(x)
= 2
The percentage of students who spend less than 4 hours a week on screens which reported a grade average below 80 is 50%
Given, we have the report representing children spending time online, on social media or watching T.V, which has there effect on there grades as above or below 80.
By the question we know that the number of students who spends less than 4 hours a week on screen is:
9 + 9
= 18
And among the 18 students there are 9 students whose grade average is below 80.
So the percentage of the students who spends 4 hours a week on screen is:
= 9 ÷ 18 × 100%
= 100/2
= 50%
hence 50% students spend less than 4 hours a week on screens.
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Given:
A number is
To find:
The scientific notation of the given number.
Solution:
Scientific notation of a number is the product of a number between 1 to 10 and 10 to the power some integer.
We have,
It can be written as
Therefore, the scientific notation of the given number is 
.
The limit does not exist. Because its left limit when x < 0 is -9, and the right limit is 2, which is not equal.
