exam Maths Puzzle Numerical Ability

What is the maximum value of q(x) = -2(x + 4)2 + 23?
@ The quadratic�s leading factor is negative (-2), so the curve opens �down� indicating it has a maximum. In the completing-t

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Please assist with finding the ratio 1/5 to 0.85 as a fraction in lowest terms.

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I attempted to have 1/5 = (.85)/x. I got x= 4/17. The choices for answers are 4/15, 4/17, & 4/19. I just to make sure I got the answer correct. Thanks. v=lwh;l