If you were to make your own measurements, your significant digits should include all of the measurable digits (the digits that correspond to the marks on the ruler) as well as one estimated position beyond the smallest measureable digit (the 5 in 3.5 cm, and the 2 in 3.52 cm).
You eliminate or ‘take away’ the answers that you know or think that r wrong. The last answer that’s left is your answer.
12x3+27x2+23x+10/ 4x+5
3x2 + 3x + 2
