exam Maths Puzzle Numerical Ability

please help me solve this equation: g(x)=1
_________
x+4

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exam Other Question

what is y=-X2+2x+3



x+1.2=1.6=5.7
I need to show how I arrive at my answer. I am totally confused. I believe the answer is 2.9 but have to show how to get that answer!!!!
Thank You
Francine