Answer:
4) 430.8 centimiters
Step-by-step explanation:
[|] Answer [|]

[|] Explanation [|]
3x + 5 = 23
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Subtract 5 From Both Sides:
3x + 5 - 5 = 23 - 5
Simplify:
3x = 18
Divide Both Sides By 3:

Simplify:
X = 6
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- Check Your Work -
Substitute 6 For X:
3 * 6 + 5 = 23
Parenthesis
Exponents
Multiply
Divide
Add
Subtract
3 * 6 = 18
18 + 5 = 23
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If it is 5 equally spaced marks, then each mark represents 1/6
0 -- 1/6 -- 2/6 -- 3/6 -- 4/6 -- 5/6 -- 1
so the third mark would represent 3/6 which reduces to 1/2