exam Maths Puzzle Numerical Ability

Z=2X-5Y
SUBJECT TO: 4X+Y<12
-6X+2Y<24
X>0, Y>0

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exam Other Question

What does 2 log2 8 - log4 256 mean or equals becuase I have no idea on what it means?...Help Me please Given the two sides of a triangle with the following measurments, find the range of possible measures for the third side.

A. 2.5 and 2.5

B. 20 and 66