which values have exactly three significant figures? select two options.\n0.0230 grams\n0.035 ounces\n0.804…

Explanation:

Step1: Recall significant - figure rules

Non - zero digits are always significant. Leading zeros (zeros before non - zero digits) are not significant. Trailing zeros (zeros after non - zero digits) are significant if there is a decimal point.

Step2: Analyze 0.0230 grams

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

Step3: Analyze 0.035 ounces

The leading zeros are not significant. It has 2 significant figures (3 and 5).

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

It has 4 significant figures (3, 1, 5, and the trailing zero due to the decimal point).

Step6: Analyze 140 feet

The trailing zero may or may not be significant without further context. If it is measured to the nearest foot, it has 2 significant figures. If it is known to be exactly 140 with the zero significant, more information is needed. Assuming standard rules without additional context, it has 2 significant figures.

Answer:

0.0230 grams, 0.804 inches