Question

Use the information given to answer the question.

An astronomer is doing research for a report on Pluto and Neptune and wants to include the information shown.

It takes the light from the Sun about 5×103
seconds to reach Earth and 4
times longer for it to reach Pluto.
The radius of Neptune is approximately 15,299
miles. When written in scientific notation, the diameter of Neptune is approximately 3.06×10x
miles.
(1 point)
Responses

8×10−4

8 times 10 to the negative 4 power

2.5×10−2

2 point 5 times 10 to the negative 2 power

1.25×103

1 point 2 5 times 10 cubed

2×104

Answer 1

Answer: 2×10^4.

Reason: Time to Pluto = 4 × (5×10^3) = 20×10^3 = 2×10^4 seconds. Also Neptune's diameter = 2×15,299 ≈ 30,598 ≈ 3.06×10^4 miles (so x = 4).