book Maths Puzzle Numerical Ability

How do you isolate B2 in the following formula?

A=1/2h(b1+b2)

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book Other Question

log of 9 to the base square root of x - log of 3 to the base x = 9 + 6 log of x to the base square root of 3 What is the value of x and y if 13x + 39y = 1664?

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