Answer:
x=3.5
Step-by-step explanation:
1. Multiply
18x-12=5x+30
2. Move the x's to one side
12x= 42
3. Isolate the variable by dividing
x=3.5
<h3>
Answer: 39</h3>
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Explanation:
You can use the nCr formula shown below

where n = 39 and r = 1. However, you could also use the identity

which basically says there are n ways to pick 1 item if you are given a choice of n items. In this specific case, we have 39 items total, and there are 39 ways to pick one item.
<span>an</span><span> = </span>a<span>n–1</span><span> + 21 the answer is c
</span>
N and n+2 because if n=1 then you do 1+2 and that equals 3. So then you have 1,3