Answer:The significant digits in 25.04 is 3 which changes it into 2504Step-by-step explanation:10 1 sig. fig. 10: "0" on the right is a placeholder. The "1" is the only significant figure and it is the estimated measurement too.
300 1 sig. fig. 300: "00" on the right is a placeholder. The "3" is the only significant figure and it is the estimated measurement too.
640 2 sig. figs. 640: "0" on the right is a placeholder. The "64" are the only significant figures. The "4" is the estimated measurement.
40030 4 sig. figs. 40030: The"0" to the right of the "3" is a placeholder. The 4003 are significant and the 3 is the estimated measurement.
304 000 3 sig. figs. 304000: The "000" are placeholders. The 304 are the significant figures. The ) between the 3 and 4 are "bookends" to the lone 0. The 4 is the estimated number.
90200 3 sig. figs. 90200: The "00" to the right of the "2" are placeholders. The "902" are the significant figures and the 2 is the estimated measurement.
3.0920 x 10-8 5 sig. figs. There are no placeholders in scientific notation. Every digit is significant in scientific notation. The digit farthest to the right is the estimated measurement. In this number it is the zero after the "2."