Question

(a+5) (a-5) =_________​

Answer 1

Answer:

$a ^{2} = 25$

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

The ratio of the speed of light in a vacuum to the speed of monochromatic light in the substance of interest. Also called the absolute index of refraction it is commonly called the refractive index or index of refraction. That ratio should be called a relative refractive index. ...