book Maths Puzzle Numerical Ability

Solve the equation for the indicated variable:

y^2-ay+10by-10ab=0 for y

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book Other Question

(IVXI) WHAT DOES THIS MEAN ALSO (VIX) THANKS PLEASE I NEED THIS THANKS AGAIN Can someone please answer this problem for me?
What units in the metric system would you use to measure each of the following quantities?
(a) Distance from Los Angeles to Ne