exam Maths Puzzle Numerical Ability

1a)9x^2 - 24 = 0
solve by root extraction

1b)2z^2+2x = 4
solve by quadratic formula

1c)(4x-2)^2 = 100 solve by root extraction
solve by root extraction

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exam Other Question

How would you solve and equation with two variables like FOR EXAMPLE: 2x+3y=6 but you need to solve for x i can't figure this out. Could I get you to help me out?

c) List the sample space.
{{{mrs frs mrm frm mrh frh mbs fbs mbm fbm mbh fbh}}} m=male, f=female r=red etc etc