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Verdich [7]
3 years ago
5

Give an example of a real-world cost that depends on an unknown amount of something. Try to create an expression to represent th

e total cost.
Mathematics
1 answer:
lakkis [162]3 years ago
5 0

Answer:

Ok, let's suppose that the unknown amount is the number of books you buy in a library. (let's represent this unknown quantity with the variable X)

We know that each book costs $9.75, and we know that in total cost for the X books is $68.25

Then, how many books do you get?

We know that if one book costs  $9.75, then X books will cost X times $9.75

Then the total cost is:

C(X) = X* $9.75

And we know that the total cost was $68.25

Then to solve this, we need to solve the equation:

X* $9.75 = $68.25

X = $68.25/$9.75 = 7

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3 years ago
"A cash drawer contains 29 bills, all twenties and fifties. If the total value of the bills is $820, how many twenties and how m
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Answer:

There are 21 twenties and 8 fifties in the drawer.

Step-by-step explanation:

This question can be solved by a system of equations.

I am going to say that:

x is the number of twenties

y is the number of fifties.

A cash drawer contains 29 bills.

This means that x + y = 29.

The total value of the bills is $820.

This means that 20x + 50y = 820.

So

x + y = 29

20x + 50y = 820

From the first equation, x = 29 - y. So:

20x + 50y = 820

20(29 - y) + 50y = 820

580 - 20y + 50y = 820

30y = 240

y = 8

And

x = 29 - y = 29 - 8 = 21

There are 21 twenties and 8 fifties.

3 0
4 years ago
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127 ^7 *28^6/ 21^7 * 16^6
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Used DVDs are on sale for a price of 5 for $20. At that price, how much will is cost to buy 12 used DVDs?
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