Algebra II
posted by Lucy on .
The problem states: Saturn is approximately 1.4x 10 to the 9th power kilometers from the Sun. If light travels at approx. 3.0 x 10 to the 5th power kilometers per second, how long does it take light from the Sun to reach Saturn? Express your answer in scientific notation.
The answers are: 4.7 x 10 to the 4th power, 4700 sec, 4.7 x 10 to the 3rd, or 47 x 10 to the 3rd.
I used the formula t=d/r
1.4 x 10 to the 9th power divided by 3.0 x 10 to the 5th power leaves 0.4666 x 10 to the 4th power.
I think the answer is 4.7 x 10 to the 3rd power. Is this correct?

Yes, that is right. You are also correct to round it off to two significant figures. Your answer is in seconds  It's about an hour and a half.