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College math

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What do these mean? They are supposed to represent things but I don't understand them. C=2╥r for r,
S=P+Prt for t,
and A=2lw+2lh+2wh for h

  • College math -

    C is the circumference of a circle with radius r

    S is the ending account balance after t periods of simple interest at "r%"

    A is the surface area of a w x l x h rectangular solid (like a brick)

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