exam Maths Puzzle Numerical Ability

-77+ (-71)=

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exam Other Question

1. y=5x^-2 (2 is negative exponent)
2. 3x-1=5x-y
3. y=|x|+3
4. x+2=2x-1
Graph the system of constraints. Then find the values of x and y that maximize A=20x+30y and list the maximum value.

x greater then or equal to 0
y greater then or equal to 0
-2x+4y less then or equal to 4
x less then or equal to 4