Question

$\left \{ {{y=2x+3} \atop {3x+2y=20}} \right.$

Answer 1

Answer:

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Answer 2

Answer:

critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees. Make particular note that the critical angle is an angle of incidence value. For the water-air boundary, the critical angle is 48.6-degrees... ....