Question

C. Round off each of the following
quantities to three significant figures :
a. 1.43 cm3 b. 458 x 102 cm
c. 643 cm² d. 0.039 m
e. 6.398 x 10-3 km
f. 0.0179 g g. 79,000 m
h. 42,150 i. 649.85;
j. 23,642,000 mm
k. 0.0041962 kg​

Answer 1

Explanation :

(a) $1.43cm^3$

The answer in three significant figures is, $1.43cm^3$

(b) $458\times 10^2cm$

The answer in three significant figures is, $4.58\times 10^4cm$

(c) $643cm^2$

The answer in three significant figures is, $643cm^2$ or $6.43\times 10^2cm$

(d) 0.039 m

The answer in three significant figures is, $3.90\times 10^{2-}cm$

(e) $6.398\times 10^{-3}km$

The answer in three significant figures is, $6.40\times 10^{-3}km$

(f) 0.0179 g

The answer in three significant figures is, $1.79\times 10^{-2}g$

(g) 79000 m

The answer in three significant figures is, $7.90\times 10^4m$

(h) 42150

The answer in three significant figures is, $4.22\times 10^4$

(i) 649.85

The answer in three significant figures is, $6.50\times 10^2$

(j) 23642000 mm

The answer in three significant figures is, $2.36\times 10^7mm$

(k) 0.0041962 kg

The answer in three significant figures is, $4.20\times 10^{-3}kg$

Answer 2

hope it's helps you

mark as brainlist