Exponents and Scientific Notation

Bob · 2011-07-12 20:10:07

hi bobbym,

I was shaken too! I'd helped someone to get answers, and then been told some were wrong. eeekkkk! Not nice for two reasons: (i) is my math wrong ? (ii) don't like to mislead a poster.

The last questions were about estimating quantities.

It's an area where it is reasonable to expect the question setter to provide multi-choice (wrong) answers that a widely different from the one correct answer. But these ones aren't. So how can anyone choose the 'correct' answer.

20. Estimate the weight of a small can of soup in grams.
A about 30 grams
B about 500 grams
C about 250 grams
D about 325 grams
E about 750 grams
F about 100 grams

I googled it and a standard sized Campbell's soup is 420g. So pick an answer ????

Bob

Last edited by Bob (2011-07-12 20:14:09)

bobbym · 2011-07-12 20:15:57

Hi Bob;

Who said they were wrong? I hope it was not me. Because if I did it was inadvertent.

I do not like those questions.

Bob · 2011-07-12 20:18:46

hi bobbym,

No, not you. Not any of us. She is doing an on-line math course. So she posted her answers and got told those ones were wrong.

huh!

I hope she isn't tested (exam) the same way.

Bob

bobbym · 2011-07-12 20:24:01

Tell you the truth, half the time I just as befuddled as the poster is. I see people with questions who have never been taught correct notation. They switch x for X, : for *, and worst of all \ for /.

She has been asked several weak questions by online tutors as have some other people here.

Bob · 2011-07-12 20:34:37

note to zee-f

As you can see from the above posts, bobbym and I have had a long look at those questions and we think it's the questions that are wrong, not you!

So have confidence; you're doing the right thing. My advice is: Move on to the next topic, and if you need help, get it here.

Bob

Last edited by Bob (2011-07-12 20:35:56)

zee-f · 2011-07-12 21:24:36

hey guys i know these questions are confusing me and i am ganna move to the next topic thanx alot for the help am ganna try to figure out how to do the ones i had incorrect ill do some google search too

bobbym · 2011-07-12 21:29:45

Hi;

Let us know how you are doing with them.

zee-f · 2011-07-12 21:33:22

ok but for #14 it gives me the following

A The conversion is not possible.

B The first problem occurs in column (1). The problem should begin with mg.

C The first problem occurs in column (2). 1 kg is not equal to 1000 g, so that should not be used as the conversion factor.

D The first problem occurs in column (2). The conversion factor is upside down (grams should be on top, and kg should be on bottom).

E The first problem occurs in column (4). The multiplication and division was performed incorrectly.

F No mistakes.

i said the problem was in the second column so is The conversion factor is upside down (grams should be on top, and kg should be on bottom???? is that correct

these question make me really confused like when i learn the lesson its easy but the questions are confuuuuusing

zee-f · 2011-07-12 21:34:23

hey bobbym

bobbym · 2011-07-12 21:43:01

Hi zee-f;

I have never seen the original question for that problem. You know the table. Bob Bundy has. I am going have to say he most likely is correct.

zee-f · 2011-07-12 21:50:43

yup i went with what bob bundy said but like how would i answer the question

A The conversion is not possible.

B The first problem occurs in column (1). The problem should begin with mg.

C The first problem occurs in column (2). 1 kg is not equal to 1000 g, so that should not be used as the conversion factor.

D The first problem occurs in column (2). The conversion factor is upside down (grams should be on top, and kg should be on bottom).

E The first problem occurs in column (4). The multiplication and division was performed incorrectly.

F No mistakes.

like they gave me the picture
the original one i posted earlier and said this

14. Examine the following solution to a conversion problem. Do you see a mistake? If so, identify the location of the first mistake and explain why it is incorrect.

i said E it was incorrect i need a new answer like it has to be from the following

zee-f · 2011-07-12 21:51:55

thats the picture

bobbym · 2011-07-12 21:55:11

I like D.

zee-f · 2011-07-12 21:56:18

yeah because it cant be c or e

bobbym · 2011-07-12 21:57:00

Or A or B.

zee-f · 2011-07-12 22:38:37

ok now for #17

17. Examine the following solution to a conversion problem. Do you see a mistake? If so, identify the location of the first mistake and explain why it is incorrect.

A No mistakes.
B The conversion is not possible.
C The first problem occurs in column (1). The problem should begin with L.
D The first problem occurs in column (4). The multiplication and division was performed incorrectly.
E The first problem occurs in column (3). We are not allowed to use a conversion factor of (1 L/ 1L).
F The first problem occurs in column (2). 1 L is not equal to 1000 kL, so that should not be used as the conversion factor.

i answered D it was incorrect

so bob bundy helped me he said the error was in the second column i need help explaining why its in the second column,

Bob · 2011-07-12 22:46:45

hi zee-f

I've posted the original diagram and my answer.

edit!

The conversion is wrong because 1kL = 1000L not the other way round. That makes it answer F.
Does that make sense?

Bob

Last edited by Bob (2011-07-12 22:49:06)

zee-f · 2011-07-12 22:47:36

yup it dose thank you

zee-f · 2011-07-12 22:49:41

but in the multi choices which one am i spouse to choose am confused on that

Bob · 2011-07-12 22:49:43

whoops. It shouldn't because that's the wrong reason. I've edited it. Look back.

Bob

zee-f · 2011-07-12 22:51:01

oooh i just saw that post sorry u answered my question

Bob · 2011-07-12 22:52:37

Don't apologise. I only did that in the edit.

Now I am sure we've arrived at the right answer. F

Ok?

Bob

zee-f · 2011-07-12 22:53:36

yup F is what am ganna submit to my teacher i hope its correct

Bob · 2011-07-12 22:54:15

so do I!!!

post back to let me know.

Bob

zee-f · 2011-07-12 22:54:43

am ganna do some googling on 19 and 20 i hope ill end up with the correct answer

Math Is Fun Forum

#126 2011-07-12 20:10:07

Re: Exponents and Scientific Notation

#127 2011-07-12 20:15:57

Re: Exponents and Scientific Notation

#128 2011-07-12 20:18:46

Re: Exponents and Scientific Notation

#129 2011-07-12 20:24:01

Re: Exponents and Scientific Notation

#130 2011-07-12 20:34:37

Re: Exponents and Scientific Notation

#131 2011-07-12 21:24:36

Re: Exponents and Scientific Notation

#132 2011-07-12 21:29:45

Re: Exponents and Scientific Notation

#133 2011-07-12 21:33:22

Re: Exponents and Scientific Notation

#134 2011-07-12 21:34:23

Re: Exponents and Scientific Notation

#135 2011-07-12 21:43:01

Re: Exponents and Scientific Notation

#136 2011-07-12 21:50:43

Re: Exponents and Scientific Notation

#137 2011-07-12 21:51:55

Re: Exponents and Scientific Notation

#138 2011-07-12 21:55:11

Re: Exponents and Scientific Notation

#139 2011-07-12 21:56:18

Re: Exponents and Scientific Notation

#140 2011-07-12 21:57:00

Re: Exponents and Scientific Notation

#141 2011-07-12 22:38:37

Re: Exponents and Scientific Notation

#142 2011-07-12 22:46:45

Re: Exponents and Scientific Notation

#143 2011-07-12 22:47:36

Re: Exponents and Scientific Notation

#144 2011-07-12 22:49:41

Re: Exponents and Scientific Notation

#145 2011-07-12 22:49:43

Re: Exponents and Scientific Notation

#146 2011-07-12 22:51:01

Re: Exponents and Scientific Notation

#147 2011-07-12 22:52:37

Re: Exponents and Scientific Notation

#148 2011-07-12 22:53:36

Re: Exponents and Scientific Notation

#149 2011-07-12 22:54:15

Re: Exponents and Scientific Notation

#150 2011-07-12 22:54:43

Re: Exponents and Scientific Notation

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