The human body is made up of about 37.2 trillion blood cells. that’s a lot of blood cells! instead of writing 37,200,000,000,000 to express this very large number, we use scientific notation to write it as 3.72 × 1013.

True.

Step-by-step explanation:

Scientific notation may be defined as the notation that can be used to write the large numbers into the simplest ways. The scientific notation follows the specific scientific rules.

The humans has 37,200,000,000,000 or 37.2 trillion cells. This number can be written in the scientific notation to make it simple. In scientific notation, we write a number as a  product of whole number between 0 to 9 and exponent of 10.

If for making whole number between 0 to 9 we move the decimal to the left side, the exponent of 10 is positive number of the shifting.  

By the above explanation, it is clear that the scientific notation of  37,200,000,000,000 is .

Thus, the answer is true.

Liliana surveyed 20 students that how many hours they spend on their computers each week.

The results are as follows

8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21

In the above results 2 students did not use computers out of 20 students.

Therefore, The total number of students who used their computers = 20 - 2 = 18

So the ratio would be 18 : 20 or 9 : 10