Aspaceship traveled 81 billion miles. in scientific notation that is how you miles?

8,1 x 10^10

Step-by-step explanation:

Billion has 9 zeros

So 81 billion miles = 81,000,000,000 miles

In scientific notation, it would be: 8,1 x 10^10

-3 > -7
u have to remember, with negatives, the larger number is smaller in value.

when u plot these numbers on the number line, the number that is farthest to the left is less then...the number that is farthest to the right is greater then. 

-3 is warmer because it is closer to zero then -7.