exam Maths Puzzle Numerical Ability

How do I add this equation?
-8+9-+5=

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exam Other Question

The volume of a quantity of an ideal gas was held constant. The inital pressure and temperature were 8000 torr and 1500 kelvins. What was the final pressure if the temperature was raised to 3270 kelvins. please help me! Solve by graphing. if necessary, estimate answer to nearest half unit.

x - 2y = -6
y = -3/2x - 1