Define constant, inverse and joint variation.

Direct Variation, where one variable is a constant multiple of another. Inverse or Indirect Variation, where when one of the variables increases, the other one decreases (their product is constant) Joint Variation, where more than two variables are related directly.

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1/3 + 1/5 = 8/15.

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answer: 8d

step-by-step explanation:

45+5= 50+5=55+5=60