Respuesta :

9514 1404 393

Answer:

  a) 31

  b) t = 2

Step-by-step explanation:

Put the given value into the equation and solve for the unknown.

a) C(4) = 4·4 +15

  C(4) = 31

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b) 23 = 4t +15

  8 = 4t

  2 = t

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