a) There are 5 significant figures in the number 0.083476.
To count significant figures:
- Non-zero digits are always significant (8,3,4,7,6).
- Leading zeros (zeros before non-zero digits) are not significant (0.0).
Therefore, the significant figures are 8,3,4,7,6, which is a total of 5 significant figures.
5
b) The absolute value of −20 is 20.
The absolute value of a number is its distance from zero, always a non-negative value.
∣−20∣=20
20
3 done, 2 left today. You're making progress.