Q: How many significant numbers are in 5.0 x 10 to the negative 3rd power?

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there are 6 significant zeros. 2.50 time 10 to the negative seven 2.50 -1 power = .250 -2 = .0250 -3 = .00250 -4 = .000250 -5 = .0000250 -6 = .00000250 -7 = .000000250 the first six are significant

The figure 18.03 has a total of four significant numbers

It is positive. Any product of an even number of negative numbers will be positive, regardless of how many positive numbers you have. Similarly any product of an odd number of negative numbers will be negative, regardless of how many positive numbers you have.

5 significant figures.

4 significant figures

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231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.

there are 6 significant zeros. 2.50 time 10 to the negative seven 2.50 -1 power = .250 -2 = .0250 -3 = .00250 -4 = .000250 -5 = .0000250 -6 = .00000250 -7 = .000000250 the first six are significant

No, not all negative numbers are rational. There are many negative numbers that are irrational, just like the positive numbers.

The figure 18.03 has a total of four significant numbers

Three. All nonzero numbers are significant, and any zeros in between significant numbers are significant.

It is positive. Any product of an even number of negative numbers will be positive, regardless of how many positive numbers you have. Similarly any product of an odd number of negative numbers will be negative, regardless of how many positive numbers you have.

Because 10.00400 is 10.004, this has five significant digits (numbers).

3 significant figures.

It has five significant figures.

7 significant figures.

3 significant figures.