To what decimal place should each answer be rounded? How many significant figures does the rounded answer have?

A. 9 cm+2.8 cm=11.8 cm(unrounded)

After rounding, the number should be reported to the

hundredths place.
tenths place.
ones place.

Thus, the number has
3 significant figures.
2 significant figures.
1 significant figure.

B. 0.135 atm+0.6 atm=0.735 atm(unrounded)

After rounding, the number should be reported to the
tenths place.
ones place.
hundredths place.

Thus, the number has
2 significant figures.
1 significant figure.
3 significant figures.