Please explain step by step and tell me how you chose the sig figs.

Carry out the following operations and express the answer with the appropriate number of significant figures and with correct rounding. Assume all values are measured values. You do not need to show your work. (a) 320.561.045/2.3 (b) [(9.953106)+(9.7104)]2.8954 (c) (0.0004520,000.0)(0.281343) (d) 865[472(3.54108)]