book Maths Puzzle Numerical Ability

I think I have the right answer but does 3a x 4b = 12ab? Thanks very much

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book Other Question

When you are doing absolute value and the problem is a negative when you solve it does it stay negative or do u ignore the negative sign? Thnx. a 15 foot ladder is placed against the wall of a house such that the botton of the ladder is at a distance of 10 feet from the wall. at what height does the ladder touch the house?