exam Maths Puzzle Numerical Ability

Find the maximum area A of a rectangle whose dimensions are x and 800-2x units.

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exam Other Question

Expand log4[(3(5x - 6)2)/(3x3(x + 2)2

A 2log4(5x - 6) - 3log4(x) - 2log4(x+2)
B (2log4(15) + 2log4(x) - 2log4(18))/(log4(3) + 3log4(x) + 2log4(x) + 2)
C log445x-32- log427x+ l Find the y intercept of the line 6x-4y=-24
Choices are:
6
-4
-6
4