4650.
4647 to 3 s.f. is 4650
4647 is 4600 to 2 sig fig.
Three significant figures.
Three. All nonzero numbers are significant, and any zeros in between significant numbers are significant.
All three digits are significant for 305.
Three significant figures.3 of them.
101.5 has four significant figures.
77,900 has three significant figures.
Three
Three.
Three of them
There are three of them