Question

Last two questions

http://prntscr.com/95jymd

Answer 1

Where are helpers @wolf1728 and @Baru

Answer 2

Here I am

Answer 3

Q1
votes please

Answer 4

My vote is that Q1 is marked with an incorrect answer.

Answer 5

Q1 incorrect

Answer 6

Q1 incorrect

Answer 7

I did the explanation last time so would one of you guys do the honors this time?

Answer 8

Okay , convert the exponential expressions into standard notation
(that is change 10^2 to 100 for example)

Answer 9

Okay what is 4.8 x 10^5 in standard notation?

Answer 10

Hmm, it would help to have kitty here.

Answer 11

Isn't this already in standard notation: 4.8 x 10^5 in standard notation

Answer 12

^ thats scientific notation

Answer 13

Yes, I thought standard notation was expressing numbers in the "ordinary, everyday" manner.

Answer 14

What if a solver just ran this "4.8*10^5 - 9.7 * 10^4=" through the "Wolf" or the Google calulator to see what number it is.

Answer 15

That could work but I always thought answers at Open Study had to be derived in a conventional fashion.

Answer 16

so sorry i d/c

Answer 17

383,000 is about as conventional as it gets.

Answer 18

Couldn't the answer be "B"?

Answer 19

In value, yes. In scientific notation, no.

Answer 20

Well, maybe not because it says "select the answer written in scientific notation".

Answer 21

Let's vote.

Do you think 3.83 * 10^5 is correct for #1?

Answer 22

@wolf1728 @baru

Answer 23

Yes

Answer 24

Yes for me.

Answer 25

yep

Answer 26

so the answer to the first should be C

Answer 27

Ergo, C for the first question.

Answer 28

So, I guess we won't select "phone a friend" or "50-50" LOL

Answer 29

xD

Answer 30

(Those are options for "Who Wants to Be A Millionaire")

Answer 31

lmao xD

Answer 32

And we have to decide on the second question (or Question 8) as it says on the test.

Answer 33

We need to save our friends and so forth for when we need them. Yes, I know those game show options. I knew a guy who was on duty to be a "phone a friend." There is nothing spontaneous about phoning a friend. Ever wonder why they are always on the spot after 2 rings?

Answer 34

Vote:

Is the OP's marked answer of C correct for the second question?

Answer 35

@wolf1728 @baru

Answer 36

I say incorrect.

Answer 37

me too

Answer 38

Incorrect.

@baru 's turn to explain why it is wrong.

Answer 39

lets take advantage of the fact that multiplication is commutative and rearrange the expression as

\( (2\times 7) (10^4 \times 10^6)\)

Answer 40

@kittymeow101
can you simplify that?

Answer 41

2 * 7 * 10 ^ (4 + 6)

Answer 42

That is correct

Answer 43

Yes, it is.

Answer 44

yep :)

Answer 45

Three Amigos: All for one and one for all on the answers.

Answer 46

xD

Answer 47

perhaps baru should have mentioned the rule to use when you are multiplying exponents.
When multiplying numbers in scientific notation you add the exponents. (which it seems you already knew).

And yes ... all for one !!!

Answer 48

yes...and we discussed the same rule on the previous question wolf

Answer 49

sorry baru - I forgot :-(

Answer 50

ty for helping

Answer 51

u r welcome kitty :-)

Answer 52

Yes, you are.

Answer 53

Did @baru forget his manners?

Answer 54

well it's getting VERY late here (6:15 a.m.) so I'll say good night (or good morning actually)

Answer 55

Same time here so I'll be moving on soon.

Answer 56

yes, it seems baru didn't say good-bye.
and see you later Directrix :-)

Answer 57

Alrighty, then. I enjoyed the camaraderie.

Answer 58

yes it was quite "camarad-ish"

Answer 59

haha sorry guys
nice meeting you all