how many significant figures do the following numbers have?

a. 1.2056 x 10^4 m:
b. 1 x 10^89 km:
c. 12,000 L:
d. 0.000345 cm:
e. 1.00036 mL:
f. 0.2056000 m:

a. 1.2056 x 10^4 m: ==> 5

b. 1 x 10^89 km: ==> 1
c. 12,000 L: ==>2 Trailing 0's are significant if no decimal is present.
d. 0.000345 cm: ==>3 Leading 0's are significant.
e. 1.00036 mL:
f. 0.2056000 m: ==> 7

Excuse the other posts.

a. 1.2056 x 10^4 m: ==> 5
b. 1 x 10^89 km: ==> 1
c. 12,000 L: ==>2 Trailing 0's are not significant if no decimal is present.
d. 0.000345 cm: ==>3 Leading 0's are not significant.
e. 1.00036 mL: ==>6
f. 0.2056000 m: ==> 7 Trailing 0's are significant when a decimal is present.

To determine the number of significant figures in a number, follow these steps:

a. 1.2056 x 10^4 m:
The number of significant figures in this number is 5. To count significant figures, start from the left and count all non-zero digits. Zeros between non-zero digits are also significant. In this case, all digits are non-zero, so all of them are significant.

b. 1 x 10^89 km:
This number is written in scientific notation, where 1 is multiplied by 10 to the power of 89. In scientific notation, the coefficient (1 in this case) indicates the significant figures. Since 1 has only one non-zero digit, it has 1 significant figure.

c. 12,000 L:
This number has 2 significant figures. Leading zeros (zeros at the beginning of a number) are not significant, so only the digits 1 and 2 are significant.

d. 0.000345 cm:
This number has 3 significant figures. Zeros that come after non-zero digits and after the decimal point are significant. The non-zero digits are 3, 4, and 5, making a total of 3 significant figures.

e. 1.00036 mL:
This number has 6 significant figures. All non-zero digits are significant, and the zeros between non-zero digits are also significant.

f. 0.2056000 m:
This number has 7 significant figures. Zeros that come after non-zero digits and after the decimal point are significant. All the non-zero digits are significant, and the zeros between non-zero digits are significant.