Finding the Difference

NOTES:
1. all steps of your solution must be shown and a few words to explain what you did to solve the problem. For instance, if lowest common denominators are required show how you determined the value of the LCD. If factors are removed, show the value of the total factor removed. Please do not just supply an answer.
 
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1 )   Find the difference of (3/16) - (1/20) =
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2 )   Perform the indicated operation   - 4 - ( - 4 ) =
 
3)   Perform the indicated  operation 3/4 + (-3/5) =   
 
4 )   A bricklayer lays one brick in 0.04 hour, while his apprentice lays one brick in 0.05 hour.
       a )   If both are working , then at what combined  rate (in bricks per hour) are they laying bricks?
       b )   Which person is working faster?

Write each exponential expression as a product without
exponents. .

6. b2 Note: this is b to the power of 2
7. (-a)5.

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Solution Preview

...0 (same as above)

so we have 15/80 - 4/80

= 11/80

2 ) Perform the indicated operation - 4 - ( - 4 ) =

= -4 + 4 (opening the bracket, and - of - becomes a +)

= 0

3) Perform the indicated operation 3/4 + (-3/5) =

in order to do the subtraction we first take the LCM of the denominators. The LCM is calculated by breaking down the denominator into lowest terms

4 = 2 x 2
5 = 1 x 5

now lcm = 2 x 2 x 1 x 5 = 20 [ calculated at the product of unique numbers in the ...