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
Gala2k [10]
3 years ago
7

A stamp collector bought 160 stamps for $25.00. The purchase included 5¢ stamps, 15¢ stamps, and 25¢ stamps. The number of 15¢ s

tamps is three times the number of 5¢ stamps. How many of each type of stamp was purchased?
Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
6 0
5- 30
15- 90
52- 40
Questions?
You might be interested in
What is 54/3 in simplest form
prohojiy [21]
I got an answer of 18. 
6 0
3 years ago
enelope determined the solutions of the quadratic function by completing the square. f(x) = 4x2 + 8x + 1 –1 = 4x2 + 8x –1 = 4(x2
Marat540 [252]
The correct question is
<span>Penelope determined the solutions of the quadratic function by completing the square.
f(x) = 4x² + 8x + 1
–1 = 4x² + 8x
–1 = 4(x² + 2x)
–1 + 1 = 4(x² + 2x + 1)
0 = 4(x + 2)²
0 = (x + 2)²
0 = x + 2
–2 = x
What error did Penelope make in her work?

we have that
</span>f(x) = 4x² + 8x + 1
to find the solutions of the quadratic function
let
f(x)=0
 4x² + 8x + 1=0

Group terms that contain the same variable, and move the constant to the opposite side of the equation

 (4x² + 8x)=-1

Factor the leading coefficient 

 4*(x² + 2x)=-1

Complete the square Remember to balance the equation by adding the same constants to each side.

 4*(x² + 2x+1)=-1+4 --------> ( added 4 to both sides)

Rewrite as perfect squares

4*(x+1)²=3

(x+1)²=3/4--------> (+/-)[x+1]=√3/2

(+)[x+1]=√3/2---> x1=(√3/2)-1----> x1=(√3-2)/2

(-)[x+1]=√3/2----> x2=(-2-√3)/2

therefore

the answer is

<span>Penelope should have added 4 to both sides instead of adding 1.</span>
6 0
3 years ago
Read 2 more answers
Select the correct answer.
mr Goodwill [35]
I believe its c because that is the suitable answer
6 0
2 years ago
All of the following are equivalent, except.
yulyashka [42]

Answer: B.

Step-by-step explanation: This is because you can't possibly have an exponent, there are no two of the same value being multiplied together.

5 0
1 year ago
20 is 60% of what number
Lilit [14]

Answer:

33.33

Step-by-step explanation:

60% of 33.33 is 20. 100% of 33.33 is 33.33, therefore 60 percent of 33.33 equals 20.

3 0
3 years ago
Read 2 more answers
Other questions:
  • Lines l, m, and n are parallel.<br><br> What is the value of x?<br><br> Here is the picture.
    14·2 answers
  • Through: (-3,-5), perp. to y=-1/3x+2
    8·1 answer
  • What is one half added to three tenths
    5·2 answers
  • Can someone answer this question please answer Roy correctly if it’s correct I will mark you beainliest
    10·1 answer
  • For f(x) = 4x + 1 and g(x) = x2 – 5, find (f – g)(x).
    11·2 answers
  • Write a decimal equation that has a product of 3.15
    9·1 answer
  • What is 1/4+3/8+1/2+5/8+7/8
    8·1 answer
  • Please help what is the area
    12·1 answer
  • If m X=49, y=41<br> X=90, y=41<br> X=41, y=49
    11·1 answer
  • A map use the scale 3/4 of an inch to represent 3 miles .if the actual distance between two cities is25 miles ,then what is the
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!