exam Maths Puzzle Numerical Ability

5a+5b divided by 5a+10

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Can you please help me solve?
2x-3y=13
x+y=-1

2x-3y=13
3x+3y=-3
--------
5x=12
x=12/5
= 2.4

x+y=-1
2.4+y=-1
y=-1-12/5
=-17/5
Consider polynomial g(x) = x^n + 4x; what is its maximum number of zeroes? @ The maximum number of zeroes = n, regardless of the value of n.
a. 0
b. 1
c. Cannot be determined without first knowing the value of n
d. None of the above