Question

of the following, select all that have 3 significant digits?
a) 810 miles
b) 400.000 kj
c) 40.0 l
d) 0.0330 calories
e) 1.80 mg
question 22 (1 point)
listen
of the following, select all that have 4 significant digits?
a) 8.700 x 10⁷ m
b) 0.008 cm
c) 0.450 g
d) 77.54 liters
e) 4.750 gpa

Explanation:

Step1: Count sig figs for Q1a

810 has 2 significant digits (trailing zero without decimal is not significant).

Step2: Count sig figs for Q1b

400.000 has 6 significant digits (all zeros after decimal and between non-zeros are significant).

Step3: Count sig figs for Q1c

40.0 has 3 significant digits (zeros after decimal are significant).

Step4: Count sig figs for Q1d

0.0330 has 3 significant digits (leading zeros are not, final trailing zero is).

Step5: Count sig figs for Q1e

1.80 has 3 significant digits (trailing zero after decimal is significant).

Step6: Count sig figs for Q2a

$8.700 \times 10^7$ has 4 significant digits (all digits in coefficient count).

Step7: Count sig figs for Q2b

0.008 has 1 significant digit (leading zeros are not significant).

Step8: Count sig figs for Q2c

0.450 has 3 significant digits (final trailing zero is significant).

Step9: Count sig figs for Q2d

77.54 has 4 significant digits (all non-zero and decimal digits count).

Step10: Count sig figs for Q2e

4.750 has 4 significant digits (trailing zero after decimal is significant).

Answer:

For "select all that have 3 significant digits":

c) 40.0 L
d) 0.0330 calories
e) 1.80 mg

For "select all that have 4 significant digits":

a) $8.700 \times 10^7$ m
d) 77.54 liters
e) 4.750 GPA