I need help with this please

3

Explanation:

If we want it to be rounded to one significant figure, it will be 3.

C. 3.14

Explanation:

That's because pi is what mathematicians call an "infinite decimal" — after the decimal point, the digits go on forever and ever. When starting off in math, students are introduced to pi as a value of 3.14 or 3.14159. Though it is an irrational number, some use rational expressions to estimate pi, like 22/7 of 333/106

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;