How many significant figures are there in the number 3,400

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!

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step-by-step explanation: the answer for wha if rt is 10 centimeters long, and wha is st? it’s 6