$$ 1 \leftarrow $$ A person buys a phone for $$ \$ 87 $$ and signs up for a single-line phone plan with 2000 monthly anytime minutes. The plan costs $$ \$ 113.92 $$ per month. Write an equation that can be used to determine the total cost, $$ C(t) $$, of this phone plan for $$ t $$ months. Then, find the cost for 21 months, assuming that the number of minutes the person uses does not exceed 2000 per month. An equation that can be used to determine the total cost, $$ C(t) $$, of the phone plan for $$ t $$ months is $$ C(t)=\square $$ (Use integers or decimals for any numbers in the expression.)

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To determine the total cost $$ C(t) $$ of the phone plan for $$ t $$ months, you need to account for both the initial cost of the phone and the monthly cost of the phone plan.

1. **Initial Cost:** The phone costs $$ \$87 $$.
2. **Monthly Cost:** The phone plan costs $$ \$113.92 $$ per month.

**Equation:**
$$
C(t) = 87 + 113.92t
$$

**Calculating the Cost for 21 Months:**
$$
C(21) = 87 + 113.92 \times 21
$$
$$
C(21) = 87 + 2,392.32
$$
$$
C(21) = 2,479.32
$$

**Total Cost for 21 Months:** $$ \$2,479.32 $$
The total cost $$ C(t) $$ for $$ t $$ months is $$ C(t) = 87 + 113.92t $$. For 21 months, the cost is \$2,479.32.

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