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dalvyx [7]
2 years ago
12

A book store bought 160 copies of a book from the publisher for $4000. If the store gives away 2 books, how much money will it l

ose?
Mathematics
1 answer:
Ghella [55]2 years ago
5 0
$4000/160=$25
Meaning that each copy is $25.
so, $25x2= $50
The answer is that the store will lose $50
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joe has a piggy bank with $8.90 split upon nickels, dimes, and quarters. The piggy bank contains 76 coins in all. The number of
kozerog [31]

Answer:

There are 38 dimes, 22 nickels and 16 quarters.

Step-by-step explanation:

Let n, d and q represent the # of nickels, dimes and quarters respectively.

Then n + d + q = 76

The value of a nickel is $0.05; that of a dime is $0.10, and that of a quarter is $0.25.

Thus, the value of n nickels is $0.05n (and so on).

The total value of the coins is $0.05n + $0.10d + $0.25q = $8.90.

d = n + q allows us to eliminate d.

First, n + d + q = 76 becomes n + (n + q) + q = 76, and second:

$0.05n + $0.10(n + q) + $0.25q = $8.90.  Here we have succeeded in eliminating d from two different equations, and now we have these two different equations in two unknowns (n and q), which is solvable.

Simplifying both equations, we get:

2n + 2q = 76 and

5n + 10n + 10q + 25q = 890, or 15n + 35q = 890

Let's use the substitution method of solving linear equations:

Rewrite 2n  + 2q = 76 as n + q = 38, or n = 38 - q.  Substituting this result into the second equation, we get:

15(38 - q) + 35 q = 890, or

  570 - 15q + 35q = 890, or

   570 + 20 q = 890.  Then 20q = 890 - 570 = 320, and q = 320/20 = 16.

There are 16 quarters.  Thus, the number of nickels is n = 38 - 16 = 22.

Finally, since n + d + q = 76, 22 + d + 16 = 76, or:

22 + d = 60, or d = 60 - 22 = 38.

There are 38 dimes, 22 nickels and 16 quarters.

4 0
2 years ago
The quotient of a number and -7 decreased by 2 is 10 find the number
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X/-7 -2 =10
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2 years ago
A wire was bent into the shape of a rectangle with width 5 and length 7 . If this wire
12345 [234]

Answer:

B | 6

Step-by-step explanation:

First, find the length of the wire by finding the perimeter of the rectangle

2(5) 2(7) = 24

If a square has 4 sides, put 24 as the numerator and 4 as the denominator.

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Now, divide it and you'll get 6, the answer.

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2 years ago
Evan washes two types of vehicles it takes him 30 minutes to wash a car and 40 minutes to wash a truck he charges $12 to wash a
a_sh-v [17]
There is no way that the amount of cars and trucks can evenly fit into the 270 minutes and $150. 
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3 years ago
Please help!!
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⋅

u

⋅

25

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50

u

Factor using the perfect square trinomial rule  

a

2

+

2

a

b

+

b

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=

(

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and  

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(

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x

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