Answer:
2
Step-by-step explanation:
When looking at a non-decimal number, we always start counting significant figures from the left and at the first nonzero number.
Here, we start counting at 3 (that's one). The 4 is another significant figure. However, we do not count trailing zeroes (like the ones here) unless they are followed by a decimal point, in which case, we would count those.
Thus, the answer is 2 sig figs.
Hope this helps!
