Question

Can someone check 12 questions for me? Please? :) Scientific Notation is the subject.

Answer 1

What is 9.46 × 10^7 expressed in standard notation?
A. 0.000000946
B. 0.0000946
C. 94,600,000 <---------
D. 9,460,000,000


What is 0.000055 expressed in scientific notation?
A. 5.5 × 10^–5 <-----------
B. 5.5 × 10^–4
C. 5.5 × 10^4
D. 5.5 × 10^5

@mathslover

Answer 2

All are right now. Go ahead.

Answer 3

There are 8.45 × 10^5 registered voters in a certain town. Half of those people are expected to vote in the upcoming election.
How many people are expected to vote in the upcoming election?
A. 4.225 × 10^2 people
B. 4.225 × 10^3 people
C. 4.225 × 10^4 people
D. 4.225 × 10^5 people <----------


Holly's city has 2.3 × 10^6 residents. Michael’s city has 3.5 × 10^5 fewer residents than Holly's city.
How many people live in Michael’s town?
A. 1.95 × 10^2 people
B. 1.95 × 10^5 people
C. 1.95 × 10^6 people <---------------------
D. 1.95 × 10^7 people

Answer 4

Yes! First one is right.

Second one.. .Hmm!

23 * 10^5 = Holly's city
Michael's city = 3.5 * 10^5


Subtract and you get = ?

Answer 5

Second one is right too! :-) (was just verifying myself)

Answer 6

1950000

Answer 7

A certain kind of passenger jet can travel at a speed of 8.4 × 10^5 meters in 1 hour.
At this speed, how far can the jet travel in 5 hours?
A. 4.2 × 10^4 meters
B. 4.2 × 10^5 meters
C. 4.2 × 10^6 meters <-------------
D. 8.4 × 10^10 meters


In 2007, China had a population of about 1.32 × 10^9. The United States had a population of about 3.01 × 10^8. Using these estimates, how many more people in 2007 lived in China than the United States?
A. 1.019 × 10^8
B. 1.019 × 10^9 <----------------
C. 1.69 × 10^8
D. 4.33 × 10^9

Answer 8

@mathslover

Answer 9

Both are right Go ahead.

Answer 10

What is 4,500,000 expressed in scientific notation?
A. 4.5 × 10^6 <------
B. 45 × 10^5
C. 450 × 10^8
D. 450 × 10^4

What is 500,000 × 6,000 expressed in scientific notation?
A. 3 × 10^6
B. 3 × 10^7
C. 3 × 10^8
D. 3 × 10^9 <-------

@mathslover

Answer 11

@mathslover

Answer 12

yes... both are right.

sorry too many tags :P

Answer 13

s'ok. :)

In the year 2000, the United States government budgeted $1,023,000,000 for the Food and Drug Administration (FDA). What is 1,023,000,000 in scientific notation?
A. 1.023 × 10^6
B. 1.023 × 10^7
C. 1.023 × 10^8
D. 1.023 × 10^9 <-------

What is 0.00000628 in scientific notation?
A. 6.28 • 10^−5
B. 6.28 • 10^−6 <--------
C. 6.28 • 10^5
D. 6.28 • 10^6

@mathslover

Answer 14

Corrrrrect!

Answer 15

There are 8.73 × 10^8 people in the world who speak Mandarin Chinese. There are 3.22 × 10^8 people who speak Spanish. How many more people speak Mandarin Chinese than Spanish?
A. 5.51 × 10^4
B. 5.51 × 10^5
C. 5.51 × 10^8 <------
D. 5.51 × 10^16

(8.88 × 104) + (7.48 × 104) = __________
A. 16.36 × 10^3
B. 1.636 × 10^4 <-------
C. 1.636 × 10^5
D. 16.36 × 10^8

@mathslover

Answer 16

First is right, second is wrong. Check it again.

Answer 17

A? @mathslover

Answer 18

Nope!

See, we have :

\( 10^4 ( 8.88 + 7.48 ) \) = \(10^4 \times 16.36 \)

Now, 16.36 * 10^4 can be written as = ?

Answer 19

163600

Answer 20

I meant to say, in scientific notation.

16.36 * 10^4 = 16.36 * 10^4 \(\times \cfrac{10}{10}\)

Now, this becomes :

16.36 / 10 * 10^4 * 10

1.636 * 10^5

Answer 21

Which = 163600 So... C? @mathslover

Answer 22

Yep.. C

Answer 23

Game over? :P I think 12 questions are done... !

Answer 24

Thanks! I'm going to bed, it's 4 am. Night! :)

Answer 25

Sure. Good Night. Sweet Dreams! :-)