exam Maths Puzzle Numerical Ability

2x+4y=24
-15x+10y=-20

x=? y=?

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exam Other Question

what is the range of the function f(x) = x squared - 20

graph the function that decreases for x less than 0 constant for x greater than 0 and less than 5 and increases for x gre Multiply the following fractions.

2x�-x-3 * 3x�+11x-20
_______ ___________
3x�+7x+4 4x�-9