exam Maths Puzzle Numerical Ability

please help to simplify

3 times the square root of a^7x^2 times the square root of ax^2

thank you

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exam Other Question

15-g=23-2g You are told that a line has a slope of -3 / 4 and that the line passes through the point given by ( -2, 3 ). Choose two other points from those given below which are on this same line.