exam Maths Puzzle Numerical Ability

Rational Expression:

3/10 = 5/x

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exam Other Question

To form a 10% copper alloy weighing 75 grams, a 6% copper alloy is combined with an 18% copper alloy. How much of each type should be used? I am having trouble graphing a parabola not centered at the origin (0,0). I also do not know how to find the vertex and focus.

The problem is (y-4)^2 = 3(x+2)

I think I fo