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jagatuba
 2 years ago
Getting from point a to point b:
Hattie purchases 3 books for $3.75 each 5 notepads for $1.75 each. She uses the following equation to figure the total (before tax):
(3 x $3.75) + (5 x $1.75)
Which of the following is another that could also be used?
a. (3 x 5) + ($ 3.75 x $1.75)
b. (3 + 5) + ($3.75 x $1.75)
c. (8 x $3.75)  $10
d. 15 + ($3.75 x $1.75)
e. $3.75 + $1.75
I know that the correct answer is c just by doing the calculation, what I want to know is how is this equation derived from the data given; what principle(s) are used to come up with (8 x $3.75)  $10?
jagatuba
 2 years ago
Getting from point a to point b: Hattie purchases 3 books for $3.75 each 5 notepads for $1.75 each. She uses the following equation to figure the total (before tax): (3 x $3.75) + (5 x $1.75) Which of the following is another that could also be used? a. (3 x 5) + ($ 3.75 x $1.75) b. (3 + 5) + ($3.75 x $1.75) c. (8 x $3.75)  $10 d. 15 + ($3.75 x $1.75) e. $3.75 + $1.75 I know that the correct answer is c just by doing the calculation, what I want to know is how is this equation derived from the data given; what principle(s) are used to come up with (8 x $3.75)  $10?

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Hero
 2 years ago
Best ResponseYou've already chosen the best response.0Looks like you already have help

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2note that $3.75 is exactly $2 more than $1.75 so, for every one of the 5 x $1.75, you can move $3.75 into the $3.75 count as longas you reduce the 5 x cost by $2

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2I hope that made sense?

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2(3 x $3.75) + (5 x $1.75) = (3 x $3.75) + (5 x ($3.75  $2.00))

saifoo.khan
 2 years ago
Best ResponseYou've already chosen the best response.0http://i1.kymcdn.com/entries/icons/original/000/009/993/tumblr_m0wb2xz9Yh1r08e3p.jpg

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2@jagatuba  did I explain it clearly enough for you?

jagatuba
 2 years ago
Best ResponseYou've already chosen the best response.0No I'm sorry. I still cannot see how we are getting from (3 x $3.75) + (5 x $1.75) to (8 x $3.75)  $10 nor what if any mathematical principles are involved.

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2ok, do you agree with this step? (3 x $3.75) + (5 x $1.75) = (3 x $3.75) + (5 x ($3.75  $2.00))

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2I don't believe there is any deep mathematical principal being used here  just rearrangement of monetary amounts to make the calculation easier.

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2you basically need to have noticed that $3.75 is exactly $2 more than $1.75 and that 5 x $2 is a nice easy calculation

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.2you will usually find street merchants are very good at these types of calculations. :)

jagatuba
 2 years ago
Best ResponseYou've already chosen the best response.0I see thank you for the explanation @asnaseer. Sorry it took so long for me to respond back. I was just getting off work and then went Christmas shopping.
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