Estimate the unite rate if 12 pairs of socks sell for $5.79

Simple,

Total= $5.79
Socks=12

Divide, 5.79/12

=0.4825

So an estimate is that each sock costs around 0.50 or 50 cents.

The correct answer for this question is that a statement that can be proven by observation or measurement is known as a fact. The other possible answers here simply refer to idea that different individuals can place value on, but that are not necessarily known to be true.