Question

identify the exact numbers.
2.54 cm (the number of centimeters in exactly 1 in)
56.00 s (a time measured by a stopwatch)
3 lbs (the weight of an object measured on a scale)
4 choices (the number of choices in this list)

Explanation:

Step1: Define exact numbers

Exact numbers are values that are known with complete certainty and have no uncertainty or measurement error. They often come from definitions or counts.

Step2: Analyze each option

• 2.54 cm in 1 in is a defined conversion, so it's exact.
• 56.00 s measured by stop - watch has measurement error, so it's not exact.
• 3 lbs measured on a scale has measurement error, so it's not exact.
• 4 choices is a count, so it's exact.

Answer:

2.54 cm (the number of centimeters in exactly 1 in), 4 choices (the number of choices in this list)