Question

which values have exactly three significant figures? select two options. 0.0230 grams 0.035 ounces 0.804 inches 3.150 liters 140 feet

Explanation:

Step1: Recall significant - figure rules

Non - zero digits are always significant. Leading zeros (zeros before non - zero digits) are not significant. Trailing zeros in a number without a decimal point may or may not be significant, but trailing zeros in a number with a decimal point are significant.

Step2: Analyze 0.0230 grams

The leading zeros are not significant. The non - zero digits 2 and 3, and the trailing zero after the decimal point are significant. So, it has 3 significant figures.

Step3: Analyze 0.035 ounces

The leading zeros are not significant. The non - zero digits 3 and 5 are significant. It has 2 significant figures.

Step4: Analyze 0.804 inches

The non - zero digits 8 and 4, and the zero between them are significant. It has 3 significant figures.

Step5: Analyze 3.150 liters

The non - zero digits 3, 1, and 5 are significant, and the trailing zero after the decimal point is significant. It has 4 significant figures.

Step6: Analyze 140 feet

The trailing zero may or may not be significant. If it is not measured precisely, it has 2 significant figures. If it is measured precisely, it has 3 significant figures. But generally, without further context, we consider it has 2 significant figures.

Answer:

0.0230 grams, 0.804 inches