There is a difference of +3 between each number, so your following number would be 21+3 = 24
hope that helps :)
(x - 4)/(x + 4)
Step-by-step explanation:

<em>Note :</em>
- a² - b² = (a + b)(a - b)
- (a + b)² = a² + 2ab + b²
This is the awnser too this one
Answer:
The answer is 11n.
Step-by-step explanation:
This is because 6n and 5n have the common term of n and you can add them up as if it were just 6 + 5.
6n + 5n = 11n
Answer:
y = 6.5
Step-by-step explanation: