Question

Find the sum of 5.21 × 1019 and 3.149 × 1017.

a) 8.359 × 1019
b) 5.24149 × 1019
c) 5.24149 × 1036
d) 8.359 × 1036

Answer 1

To find the sum of these two numbers, we need to add the numbers and keep track of the powers of 10.

5.21 × 10^19 + 3.149 × 10^17

To add these numbers, we need to align the decimal points by moving 3 places to the right for 3.149 × 10^17, giving us:

5.21 × 10^19 + 0.003149 × 10^19

Adding these numbers gives us:

5.213149 × 10^19

So the correct answer is:

a) 5.213149 × 10^19