Fernando built a robot to filter air and water efficiently. he expects the robot to filter more than 512 liters of air and water while using less than 9 joules of energy.
a represents the number of minutes the robot filters air, and w represents the number of minutes the robot filters water.
21a+14w > 21a+14w> 51, a, plus, 14, w, is greater than, 512 represents the number of minutes the robot filters air and water to filter more than 512512512 liters of air and water.
0.36a+0.6w < 90.36a+0.6w< 90, point, 36, a, plus, 0, point, 6, w, is less than, 9 represents the number of minutes the robot filters air and water while using less than 9 joules of energy.

where are the options?

step-by-step explanation:

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sorry can't

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i googled though and something came up but it was in science langueage not common english sooo

12cm

the answer is d