Respuesta :

DeathPotato

Answer:

I believe the answer is  d = 32

Step-by-step explanation:

You should isolate the radical, then raise each side of the equation to the power of its index.

sqdancefan

9514 1404 393

Answer:

  d = 32

Step-by-step explanation:

Add 4, then square, and solve the resulting linear equation.

  √(7d +1) = 15

  7d +1 = 225 . . . . . . square both sides

  7d = 224 . . . . . . . . subtract 1

  d = 32 . . . . . . . . . . divide by 7

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