Chapter 2, Problem 50QAP

Without actually performing the calculations indicated, tell to how many significant digits the answer to the calculation should be expressed.

   $\frac{\left(9.7871\right)\left(2\right)}{\left(0.00182\right)\left(43.21\right)}$

   $\left(67.41+0.32+1.98\right)/\left(18.225\right)$

   $\left(2.001\times {10}^{-3}\right)\left(4.7\times {10}^{-6}\right)\left(68.224\times {10}^{-2}\right)$

   $\left(72.15\right)\left(63.9\right)\left[1.98+4.8981\right]$