Question

choose the correct answer with the correct number of significant figures. (56.3 - 55.3)(2.89) / (3.24 + 19.432) = ________ 56.3 0.13 55.3 3.24 20.3 20.32 2.89 0.1275 clear my selection

Explanation:

Step1: Calculate numerator

$(56.3 - 55.3)\times2.89=1\times2.89 = 2.89$

Step2: Calculate denominator

$3.24+19.432 = 22.672$

Step3: Calculate the result

$\frac{2.89}{22.672}\approx0.1275$
But considering significant - figures, in the subtraction $56.3 - 55.3 = 1$ (1 significant figure), so the final result should have 2 significant figures. Rounding $0.1275$ to 2 significant figures gives $0.13$.

Answer:

0.13