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I'm so bored

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?