Question

Aubrey broke a cell sample into 15 batches, each weighing 1, point, 3, times, 10, to the power minus 71.3×10
−7
grams. How much did the original sample weigh? Use scientific notation to express your answer.

Answer 1

Each batch weighs 1.3 × 10^−7 g. Total = 15 × (1.3 × 10^−7) = 19.5 × 10^−7 g = 1.95 × 10^−6 g.

So the original sample weighed 1.95 × 10^−6 grams.