exam Maths Puzzle Numerical Ability

Determine the value of k when:

q is inversely proportional to the sum of x and y. If x=0.5 and y=0.7, then q=1.4

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exam Other Question

Please can you help me find x

((( 3x² - 6x + 1 = 0 )))
Please help me with this question:

What is the equation of a line, g(x), that is perpendicular to f(x)=1/2x+2 and passes through (0,2)?

a) g(x)=-4x+2
b) g(x)=-4x-2
c) g(x)=-4x-8
d) g(x) can not be determined with this information