An hourglass is turned over with the top part filled with sand. After 3 minutes, there are 855 mL of sand in the top half. After 10 minutes, there are 750 mL of sand in the top half. Select the equation that represents this situation.



A y = 285x B y = −10.5x + 900

C y = 75x D y = −15x + 900

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