During a sale at the bookstore, books sold for $3 and magazines sold for $2.50. Jan spent $16 and bought a total of 6 books and magazines. How many of each did she buy

Answers

Answer 1
Answer: In the given question, there are several information's of immense importance. using these information's the required answer can be easily deduced. It is already given that Jan had spent $16 for buying books and magazines. The cost of each book is $3 and the cost of each magazine is $2.50. Jan bought a total of 6 books and magazines.
Let us assume  that the number of books Jan bought = x
the number of magazines Jan bought = y
Then
x + y = 6
x = 6 - y
and
3x + 2.5y = 16
Replacing the value of x from the first equation in the second we get
3x + 2.5y = 16
3(6 - y) + 2.5y = 16
18 - 3y + 2.5y = 16
- 0.5y = -2
y = 2/0.5
  = 4
Replacing the value of y in first equation we get
x + y = 6
x + 4 = 6
x = 2
So Jan bought 2 books and 4 magazines.

Answer 2
Answer:

Answer:

She bought 2 books and 4 magazines


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5x-8 (4x-7)=2 solve for x

Answers

5x - 8(4x - 7) = 2

First, expand your problem. / Your problem should look like: 5x - 32x + 56 = 2
Second, simplify 5x - 32x + 56. / Your problem should look like: -27x + 56 = 2
Third, subtract 56 from both sides. / Your problem should look like: -27x = 2 - 56
Fourth, subtract 2 - 56 to get -54. / Your problem should look like: -27x = -54
Fifth, divide both sides by -27. / Your problem should look like: x =  (-54)/(-27)
Sixth, simplify the fraction to - (54)/(27) / Your problem should look like: x =  (54)/(27)
Seventh, simplify. / Your problem should look like: x = 2

Answer: x = 2

Which fraction is equivalent to 72%?
A. 7/200
B. 18/25
C. 9/25
D. 7 1/5

Answers

B 18/25
18/25=x/100
x=1800/25=72%

If BC= 6.5, CD= 7.8, and AD=12.2, find AB to the nearest tenth

Answers

Assuming that each of these letters are splitting this half and half (based off of the information given here) then AB would be 9.4

Two different pairs of negative integers, x and y, that make the statement x − y = −1 true

Answers

one way is
solve for x
add y to both sides
x=y-1

sub negative values for y and get negative values for x
if y=-1, x=-2
if y=-3, x=-4
and so on

some points
(-2,-1)
(-3,-2)
(-4,-3)
(-5,-4)
(-6,-5)
etc
No, X+Y (both of them being negative integers) equal -1. Just a small miscalculation.

The area of a rectangular pool is (14x^2+21x) square feet. If it is 7x feet long, what is the width, in feet?

Answers

(14x^2+21x) = 7x(2x + 3)

A= L * W

but L = 7x so W = 
2x + 3

answer: 
width is (2x +3) feet

Answer:

you get (2x+3), because 14 divided by 7 = 2 and 21 divided by 7 = 3

Step-by-step explanation:

Solve the inequality -10w _< 20

Answers

Step-by-step explanation:

  • -10w<20
  • w<20/-10
  • w<-2

hope it helps

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