book Maths Puzzle Numerical Ability

What is the y-intercept for y+2=-2?

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book Other Question

Rearrange the following so that the letter becomes the subject

y = 4z √y+z/x; x =

Can you please show your working out, and thank you in advance Solution A is 30% alchol and Solution B is 75% alchol. How much of each should be used to in order to make 100 liters of a solution that is 50% alchol?