Question

The radius of the sun is on average 696,000 km. The radius of Venus is 6,051.8 km. What is the difference in their diameters?
Write the answer in scientific notation.



Click on the correct answer(s)

A
6.90 x 10 5 km

B
6.90 x 10 −5 km

C
1.38 x 10 −6 km

D
1.38 x 10 6 km

Answer 1

I think A or B... not sure

Answer 2

The diameter is twice the radius.
You can do this two ways:
1) Find each diameter by multiplying each radius by 2. Then subtract the diameters.
Using this method you need to do 2 multiplications and 1 subtraction.
2) Subtract the radii. Then multiply the result by 2. Using this method, you only do 1 subtraction and 1 multiplication.
Both methods will give the same answer.