Assignment 19

019. `query 19

College Algebra

04-10-2008

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09:46:36

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: 0

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09:46:48

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

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RESPONSE -->

ok

self critique assessment: 3

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09:48:47

query 4.2.20 536 + 279 in expanded notation

Write 536 + 279 in expanded notation.

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RESPONSE -->

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

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

confidence assessment: 0

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09:49:39

** 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 -->

ok

self critique assessment: 3

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