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When multiplying, the number of significant numbers in the answer should be the same as the fewest significant figures in the problem. Both 13.5 and 3.00 have three significant figures, so the answer will have three significant figures. 13.5 x 3.00 = 40.5 exactly (no need to round).
For 25600.0, shift 4 decimal places to the left. Then, 2.56 x 104 has 3 sig figs, which are rounded up "already".
Two of them.
There are 2 significant figures in 7.8x109^?
The number 1.89 x 10³ has three significant figures. The digits 1, 8, and 9 are all non-zero digits, which are counted as significant. The scientific notation does not affect the number of significant figures in the coefficient.