1. **State the problem:** We are given the sequence 95, 80, 65, 50, ... and need to find the function $a(n)$ that represents this sequence.
2. **Identify the pattern:** The sequence decreases by 15 each time:
$$80 - 95 = -15, \quad 65 - 80 = -15, \quad 50 - 65 = -15.$$
This suggests a linear function with a common difference of $-15$.
3. **General form of an arithmetic sequence:**
$$a(n) = a_1 + (n-1)d,$$
where $a_1$ is the first term and $d$ is the common difference.
4. **Plug in values:**
$$a_1 = 95, \quad d = -15,$$
so
$$a(n) = 95 + (n-1)(-15) = 95 - 15(n-1).$$
5. **Simplify:**
$$a(n) = 95 - 15n + 15 = -15n + 110.$$
6. **Check with given options:** The function that matches is
$$a(n) = -15n + 110.$$
7. **Verify with terms:**
For $n=1$,
$$a(1) = -15(1) + 110 = 95,$$
for $n=2$,
$$a(2) = -15(2) + 110 = 80,$$
which matches the sequence.
**Final answer:**
$$a(n) = -15n + 110.$$
Arithmetic Sequence B5308A
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