exam Maths Puzzle Numerical Ability

Solve system using elimination method
x^2+3y=25
x+y=7

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exam Other Question

Need help please
Okay
need the degree and equation:

n 1 2 3 4 5
f(n)11 21 35 53 75

i think the degree is 4 and it is linear
but that is as far as I can get
Help Please

Thanks
llo what is the standard form equation of the conic given ? 4x^2-5y^2-16x-30y-9= 0