exam Maths Puzzle Numerical Ability

please help if you can
Find the maximum value of
z = 7x + 3y
subject to the contraints
x >= 0
y >= 0
2x + y <= 4

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exam Other Question

Find the real solution of the given equation. Give exact values.

7/(x+5) - 3/(x+1) = -1

The answer given is -5 plus or minus 2 times the square root of 7
worked that out fo You are the chief financial advisor to a corporation that owns an office complex consisting of 50 units. At $400 per month, every unit can be rented. However, for each $20 per mont