Book Assignment 19

course Mth 151

Assignment 21 did not run with book 4.4

d?????P??????assignment #019019. `query 19

College Algebra

07-24-2008

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14:18:45

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+*10^2+1*10^1+2*10^0

confidence assessment: 3

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14:18:59

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

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RESPONSE -->

ok

self critique assessment: 2

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14:22:11

query 4.2.20 536 + 279 in expanded notation

Write 536 + 279 in expanded notation.

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RESPONSE -->

problem in book is different

536 5*10^2+3*10^1+6*10^0

+ 279 2*10^2+7*10^1+9*10^0

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815

confidence assessment: 2

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14:22:27

** 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:

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????Z????????

assignment #021

021. `query 21

College Algebra

07-24-2008

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14:24:21

4.4.24 a, b, c values that show that a + (b * c) not equal to (a+b) * (a+c).

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RESPONSE -->

ok

confidence assessment:

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14:24:28

** For example if a = 2, b = 5 and c = 7 we have

a + (b + c) = 2 + (5 + 7) = 2 + 12 = 14 but

(a+b) * (a+c) = (2+5) + (2+7) = 7 + 12 = 19. **

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RESPONSE -->

ok

self critique assessment:

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