Question

The mass of the Rock of Gibraltar is 1.78 ⋅ 10^12 kilograms. The mass of the Antarctic iceberg is 4.55 ⋅ 10^13 kilograms. Approximately how many more kilograms is the mass of the Antarctic iceberg than the mass of the Rock of Gibraltar? Show your work and write your answer in scientific notation.

Answer 1

scientific notation is the form of writing a number:
\[a*10^n\], where 0<a<10 and n is any natural number

Answer 2

you already have masses written in scientific notation. So you just need to solve
\[4.55*10^{13} - 1.78*10^{12}\]

Answer 3

Thanks @ksanka

Answer 4

you can do this way:
\[4.55∗10^{13}−1.78∗10^{12}=10^{12}*(4.55*10-1.78)\]
then solve for the number in brackets

Answer 5

The numbers in the brackets equal 43.72

Answer 6

in brackets you get 43.72. But the a must be less than 10, so the answer will be
\[4.372*10^{12}*10=4.372*10^{13}\]

Answer 7

let me check on calculator, for if I made a mistake.

Answer 8

Okay

Answer 9

yep, that's right!