Question 1

The speed of light in a vacuum is 299,792,458 meters per second. Which number, written in scientific notation, is the BEST approximation of the speed of light?

Accepted Answer

$3.0	imes10^8$ meters per second

Answer

$3.0	imes10^7$ meters per second

Answer

$0.3	imes10^7$ meters per second

Answer

$0.3	imes10^8$ meters per second

Question 2

A certain human red blood cell has a diameter of 0.000007 meters. Which expression represents this diameter, in meters, in scientific notation?

Accepted Answer

$7	imes10^{-6}$

Answer

$7	imes10^6$

Answer

$7	imes10^{-5}$

Answer

$7	imes10^5$

Question 3

City $X$ has a population of $3 	imes 10^5$  and City $Y$ has a population of $6 	imes 10^6$. Which statement correctly describes the relationship between the populations of City $X$ and City $Y$?

Accepted Answer

The population of City $Y$ is 20 times the population of City $X$.

Answer

The population of City $X$ is 300,000 less than the population of City $Y$.

Answer

The population of City $X$ is 3,000,000 less than the population of City $Y$.

Answer

The population of City $Y$ is 2 times the population of City $X$.

Question 4

Kevin moved from a city to a small town. The population of the city is $6	imes 10^5,$ which is about $15$ times as great as the small town. Which expression could represent the approximate population of the small town?

Accepted Answer

$4	imes 10^4$

Answer

$9	imes 10^6$

Answer

$9	imes 10^5$

Answer

$4	imes 10^3$

Question 5

Ellentown College has approximately $3	imes10^3$ students and Pengrove University has approximately $30,000$ students. How many times as much is the number of students at Pengrove University as the number of students at Ellentown College?

Accepted Answer

$10$

Answer

$1$

Answer

$100$

Answer

$30$

Question 6

Bianca and Nick are both musicians who sell their songs online. During the same year, Bianca sold $8 	imes 10^5$ downloads of her songs and Nick sold $4	imes 10^6$ downloads of his songs. How many times as much is the number of songs that Nick sold than the number of songs that Bianca sold?

Accepted Answer

$5$

Answer

$40$

Answer

$20$

Answer

$2$

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