The answer is 10.5
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Answer:

Step-by-step explanation:
Given
Round 0 1 2 3
Points 25 75 225 675
Required
Determine the equation
Let n = rounds and p = points.
So, we have:



The above shows a geometric progression.
So, we solve using

In 
n = 0 and p = 25
Substitute these values in 




In 
n = 1 and p = 75
Substitute these values in 


Substitute 25 for a

Make b the subject


So, we have:
and 
The equation
becomes

Answer: x= -1, y= -3
Step-by-step explanation
solve like a system of equations
x-y-2 = 0
+
x+y+4=0
------------
2x+2=0, 2x= -2, x= -1, then plug that back into either equation
-1+y+4=0, y+3=0, y= -3
Because 42 is a multiple of 2