If five is subtracted from three times a certain number, the result is 10.what is the number?

First, you would need to form an equation. Five subtracted from a 3 times a number (let's use a variable 'n') would be: 3n - 5.
3n - 5 = 10.

Next, isolate the variable.
3n - 5 = 10
    + 5   + 5
     3n = 15

Lastly, solve for n.
3n/3 = 15/3
n = 5

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answer:
congruent segments
step-by-step explanation:
congruent segments. take a line, cut it in half, superipose one half over the other half; you'll have congruence.