Assignment 19

course Mth 151

??????n?|????assignment #019019. `query 19

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College Algebra

10-21-2007

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17:31:02

query 4.2.6 53812 in expanded form.

What is 53812 in expanded form?

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RESPONSE -->

5*10^4 + 3*10^3 + 8*10^2 + 1*10^1 + 2*10^0

confidence assessment: 2

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17:31:25

STUDENT RESPONSE: (5*10^4) +(2*10^3) + (1*10^2) +(8 * 10^0)

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RESPONSE -->

I did not put ( ).

self critique assessment: 2

Your notation is fine. I used the ( ) for additional emphasis on the grouping, to avoid possible confusion.

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17:34:48

query 4.2.20 536 + 279 in expanded notation

Write 536 + 279 in expanded notation.

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RESPONSE -->

815 = (8*10^2) + (1*10^1) + (5*10^0)

confidence assessment: 2

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17:36:00

** We write this sum as

5 * 10^2 + 3 * 10^1 + 6 * 10^0 +

2 * 10^2 + 7 * 10^1 + 9 * 10^0

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8 * 10^2 + 10* 10^1 + 15* 10^0. Since 10 * 10^1 = 10^2 we can write this as

9 * 10^2 + 0 * 10^1 + 15 * 10^0.

Since 15 * 10^0 = 10 * 10^0 + 5 * 10^0 = 10^1 + 5 * 10^0 we rewrite this as

9 * 10^2 + 1 * 10^1 + 5 * 10^0.

This result is expressed in our place-value system as

915. **

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RESPONSE -->

I think I came up with 815 instead of 915.

self critique assessment: 2

Your result is correct.

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This looks good. See my notes. Let me know if you have any questions. &#