1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Stels [109]
3 years ago
13

Explain how to resolve this problem. there are 13 books.some books cost $9 each and the rest cost $8 each. A total of $108 spent

for all 13 books. how many $8 books were on the table.
the answer is actually 9. nine $8 books totals $72 and four $9 books total $36. $72+$36=$108. and 9+4=13 books
Mathematics
2 answers:
Katen [24]3 years ago
6 0
X=one type that cost 9
y=one type that cost 8

total books=type1+type2
total books=13
x+y=13

the total cost=cost of each added together
cost of each=number of books times cost per book
total cost=108
9x+8y=108


we have
x+y=13
9x+8y=108
solve for x and y

multiply first equation by -8 and add to first equation
-8x-8y=-104
<u>9x+8y=108 +</u>
x+0y=4

x=4
subsitute
x+y=13
4+y=13
minus 4
y=9

4 of the $9
9 of the $8

thats how to solve
Natasha_Volkova [10]3 years ago
3 0
The ancwer is 9 .nine $8 books.
You might be interested in
Could you please help me? -0.7-(-2.5)=
Reika [66]
-0.7 - (-2.5) = 

-0.7 + 2.5 = 

2.5 - 0.7 = 1.8

1.8 is your answer

hope this helps
3 0
4 years ago
Given: Triangle ACD is isosceles; &lt;1 is congruent to &lt;3 Prove: Segment AB || Segment CD
julsineya [31]

Answer:

Segment AB || Segment CD

Step-by-step explanation:

Two lines are said to be parallel (||) if they do not meet, even when extended to infinity.

Given: <1 ≅ <3, ΔACD is an isosceles triangle.

Proof: Segment AB || Segment CD

From the diagram given,

AC ≅ AD (side property of isosceles triangle)

<3 = <4 (base angle property of an isosceles triangle)

<1 = <4 (alternate angle property)

Therefore, segment AB is parallel to segment CD.

8 0
4 years ago
Write the scale factors and values for x for the pairs of similar triangles below. 9 cm x cm 4 cm 2 cm Scale Scale Factor: X=​
Neporo4naja [7]

The scale factor of the similar triangles is: 1/2. The value of x is: 4.5 cm.

<h3>Scale Factor of Similar Triangles</h3>

Scale factor of similar triangles is the ratio of their corresponding sides.

Given the two similar triangles in the diagram attached below, we have the following scale factor as:

Scale factor = 2/4 = 1/2

Therefore:

x = 1/2 × 9

x = 4.5 cm.

Therefore, the scale factor of the similar triangles is: 1/2. The value of x is: 4.5 cm.

Learn more about scale factor on:

brainly.com/question/2826496

8 0
3 years ago
What is the range of the graph shown below
RUDIKE [14]
Theres nothing there tho
8 0
3 years ago
Sorry I'm not good at math but I just want to learn how to do this
kolezko [41]
The answer is 8.6. I hope this helped you out!
4 0
4 years ago
Other questions:
  • Find the angle measure of the missing angle for a triangle with angle measures of 37 degrees and 75 degrees.
    8·1 answer
  • You need to simplify L please help
    6·2 answers
  • Anybody Knows This Answer I Need Help You Guys !!
    10·1 answer
  • Sally wants to build a three-sided fence enclosing a rectangular play area in her backyard. the area will be exactly 500 square
    7·1 answer
  • A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 580 babies were​ born, a
    10·1 answer
  • Bananas cost $0.75 per pound. Use an equation to determine the cost of 9 pounds.
    6·2 answers
  • Help that’s it just help I’ll give brainiest
    9·1 answer
  • Can please answer these 3 questions
    5·1 answer
  • Andy, Fergus, Evelyn, and Margaret are collecting cans for recycling. Before lunch they have collected a total of 173 cans. At t
    6·1 answer
  • Solve pls brainlies
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!