The equation seems to be
1
-------- = 5 ^ (x + 4)
25
In that case, this is the solution, stept by step:
1) factor 25: 25 = 5^2
1
=> ----------- = 5^(x + 4)
5^2
2) invert 5^2
=> 5^(-2) = 5^(x+4)
3) Given that the bases are equal, the exponents also have to be equal:
=> - 2 = x + 4
3) transpose +4:
=> - 2 - 4 = x
=> x = - 6
Answer: - 6
<em>To get all possible permutations of these five spaces, we just multiply these numbers (that is, 8∗7∗6∗5∗4=6,720)</em>
<em>There are 6,720 five digit numbers that can be formed from the digits provided given that no digit may be repeated.</em>
<em>Hope that helped!</em>
Answer:
the answer is in the picture below
Step-by-step explanation:

The answer is B for increase of one year the events increase by 0.5
You can do this by using the eqn
y=0.5x-1.3
y=0.5(15)-1.3
y = 7.5-1.3
y = 6.2
y=0.5(16)-1.3
y=8-1.3
y=6.7
6.7-6.2 = 0.5