exam Maths Puzzle Numerical Ability

Activity Cal/h Activity Cal/h
Bicycling 6 mi/h 240 Running 10 mi/h 1,280
Bicycling 12 mi/h 410 Swimming

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exam Other Question

HELP

a)solve 4x^2=12 I have to find x for this one
b)Find the intercepts of f(x)=4x^2-12

I am totally lost on this
Thanks
Solve by the addition method.
3x-2y=-7
4x+3y=2