Which is the best estimate for (6.3 times 10 superscript negative 2 baseline) (9.9 times 10 superscript negative 3 baseline) written in scientific notation?
6 times 10 superscript negative 4
60 times 10 superscript negative 5
6 times 10 superscript 7
6 times 10 superscript 7

First option:  

Step-by-step explanation:

The expression is:

Scientific Notation (which is also known as "Standard form"), is a way to write numbers. It is very useful to handle very small numbers and very large numbers.

By definition, Scientific Notation has the following form:

Where the coefficient "a" is a number from 1 to 10 without including 10, and the exponent "n" is an Integer.

Given:

If you want to estimate the result, you can round the coefficients to the nearest whole number. Since the decimal point must be just after the first digit, you know that:

Now you need to remember the Product of powers properties:

Then, solving the multiplication, you get:

the answer is 5/3x+7/5y+7

answer: .75 km

step-by-step explanation: