**(b)** (1.4 × 2.639) + 117.24

Now, 1.4 × 2.639 = 3.6946

Use the product rule (3 above), the result would be rounded off to the least number of significant digits of the input numbers. 1.4 has 2 sig figs and 2.639 has 4. Therefore, the result would be rounded off to 2 sig figs. All the number after 6 would be dropped. As there is 9 following 6, therefore, the accepted result is 3.7.

In the second step, we find 3.7 + 117.24 = 120.94

Use rule for addition (rule 1 above) and the result should be rounded off to 1 decimal place. (Remember, 3.7 has 1 decimal place). Therefore, the answer would be rounded off to 120.9.

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This is very helping website love it very good work for students thankyou thankyou very much 💕

AnabiaYou are always welcome. Thanks.