Answer:

Step-by-step explanation:
Total red haired students = 15+5 = 20
Boys = 15
<u><em>Fraction:</em></u>
=> 
<u><em>In simplest form:</em></u>
=> 
Additive indentity

n = 1
a variable is always a number itself remember 7+n
5+2 = 7
Real numbers can be both rational and irrational.
sqrt(13) = 3.60555
sqrt(14) = 3.74166
If you're looking for a rational number, there are lots of them to choose from. Easiest is probably 3.7 = 37/10.
An irrational number in this range might be sqrt(27/2).
Hope this helps!
Answer:
Correct
Step-by-step explanation:
The given expression is : 4n - 2
Chris says that the expression (4n-2) can be written as 2(2n - 1).
Taking 2 common on the given expression.
(4n-2) = 2(2n-1)
Hence, he has wrote it in a correct way.