Answer:
the answer is B)13800
Step-by-step explanation:
I took the test
Answer:
(4,6) is the solution.
Step-by-step explanation:
Given 
Let the solution be
.
The solution to this line means it should satisfy the equation. Therefore, substituting this we get,


Dividing by 4 throughout we get,

Therefore, the solution is: (4,6)
5^23 - 5^21 = 5^(21+2) - 5^21
5^23 - 5^21 = 5^21*5^2 - 5^21*1
5^23 - 5^21 = 5^21*(5^2 - 1)
5^23 - 5^21 = 5^21*(25 - 1)
5^23 - 5^21 = 5^21*24
5^23 - 5^21 = 24*5^21
5^23 - 5^21 = 24*k
The original number is in the form 24k where k = 5^21, so this proves that the original number is a multiple of 24