book Maths Puzzle Numerical Ability

y-4=1/2(x--5)

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book Other Question

How can we locate the cosecutive numbers to each real number? How can I solve this? Find x.
1. (64) raise to x = 8
2. ([the square root of 49]) raise to 1/2 = x
3. 1/16 = 16 raise to x