exam Maths Puzzle Numerical Ability

I am going back to school after 14 + years of being out, seems as if I have lost most of my knowledge about algebra I am in need of some help solving this problem below

Graph y=5x - 2

(graphing linear equations)

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exam Other Question

what is the value of c in the formula c = square 2a^2 + b^2 if a=4 and b=5? Write a polynomial function of least degree that has real coefficients, the given zeros and a leading coefficient of 1

18. 1,-3,4
19. 2,2,-1,0