How many significant figures are there in each of the following? (a) 69.6t 0.4 (b) 3.2 x 109 (c) 2 x 10-6 (d) 0.0028

a) Three significant figures.

b) Two significant figures.

c) One significant figures.

d) Two significant figures.

Explanation:

a) 69.6 ± 0.4

By place decimal below decimal and then adding or subtracting will get 3 significant figures.

69.6 + 0.4 = 70.0

69.6 - 0.4 = 70.2

b)

Two significant figures.

c)

one significant figures.

d) 0.0028

Two significant figures.

0.55x745.7j and a calculator

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up