Express this number in scientific notation 50000

5×10^4

Explanation:

scientific notation: a×10^b, where should be 0<a<10

Step 1. Count the zeros

There are in total 4 zeros in 50000, so we write the exponent as 10^4

Step 2. Look at the number left

The number left is 5, which technically should be the [a] in the expression. But first, we need to check whether or not is it in the proper range of [a].

0<5<10, is it true? YES

So the final expression should be 5×10^4

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hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b