Interpret intercepts and starting values in contextual linear situations.
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Problem
A service charges a \(\$9\) sign-up fee at \(\text{month}~0\). State the starting value.
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What this problem is really about
Starting value means the amount already present when the time input is zero. Identify what charge has occurred at month zero and keep it separate from any recurring monthly rate; a one-time fee contributes to the initial amount, not to every later time step. No additional rate information is needed to read that starting state.
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