exam Maths Puzzle Numerical Ability

The length of a retangular pool is 6 meters less than twice the width. If the pools perimeter is 126 meters, what are its dimensions?

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exam Other Question

Hi can you help me with the following problem?
Write the answer in standard form of scientific notation correctly rounded to 2 figures.
(2.66 x 10^-9) ( 6.95 x 10^1)
_________
Find the slope of the line that passes through the pair of points.

(1,7),(10,1)