4. Complete the operations a) - e), as indicated, in each case reporting the result using the proper number of significant digits:- a) 19.2 x 37 \text { b) }

0.0230 \times 7.60 \times 10^{3} \text { c) } \frac{101}{3463} \text { d) } \frac{4.023}{17.74} \text { e) } 24.456-3.22