exam Maths Puzzle Numerical Ability

Give the zeros of the function, f(x)= x squared + 6x + 8 over x squared + 4x +4
A. All real numbers except -2 and -4
B.-2 and -4
C. all real numbers excpet -2
D. -4

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exam Other Question

A horse and a cow togather cost $800.the horse is sold a a profit of 10% and the cow t loss of 10%.If the total profit of 2.5% is made,what is the cost price of the horse? I don't get this question. I know it hads to do with ax+by+c=0. If you can help me that will be great because I have a test on this.