Question

The mass of a freight train is 9.98 ⋅ 10^6 kilograms. The mass of an aircraft carrier is 7.3 ⋅ 10^7 kilograms. Approximately how many more kilograms is the mass of an aircraft carrier than the mass of a freight train? Show your work and write your answer in scientific notation.

Answer 1

@3mar

Answer 2

Thank you.

Answer 3

welcome

Answer 4

I think it is a very basic simple subtraction

Answer 5

Can you carry on?

Answer 6

730,000,000-998,000,000

Answer 7

where is the step?

Answer 8

it ends up being a negative

Answer 9

or did i do it wrong

Answer 10

It shouldn't be negative.

Answer 11

what did i do wrong

Answer 12

you should do
7.3 ⋅ 10^7 - 9.98 ⋅ 10^6

notice the exponents are different.
you should change 7.3 ⋅ 10^7 to 73 ⋅ 10^6
(notice we multiplied 7.3 by 10 and to compensate, reduced 10^7 to 10^6)

now you have
73 ⋅ 10^6 - 9.98 ⋅ 10^6

Answer 13

The mass of an aircraft carrier - the mass of a freight train=7.3(10^7)-9.98(10^6)=63,020,000=63.02(10^6)

Answer 14

To find what 9.98 x 10^6 kg is, you move the decimal place over six places to the right. For 7.3 x 10^7 you move the decimal place over seven spots to the right.