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
Ray Of Light [21]
2 years ago
8

You have 23 coins, including nickels, dimes, and quarters. if you have two more dimes than quarters, and the total value of the

coins is $2.50. how many of each kind of coin do you have?
Mathematics
2 answers:
olchik [2.2K]2 years ago
8 0

Hi there i hope this will help

n + d + q = 23 . . . . . . . there are 23 coins total

 0n +d -q = 2 . . . . . . . . .there are 2 more dimes than quarters

 5n +10d +25q = 250 . .the total value is $2.50

The collection includes 11 nickels, 7 dimes, and 5 quarters.

I used the matrix function of my calculator to solve these equations. You can find q by subtracting from the last equation five times the sum of the first two equations.

 (5n +10d +25q) -5((n +d +q) +(d -q)) = (250) -5(23 +2)

 25q = 125 . . . . . . . simplify

 q = 5

From the second equation,

 d = q +2 = 7

And from the first,

 n = 23 -5 -7 = 11

<h2>answer is 11</h2>
Tanzania [10]2 years ago
7 0
You can write three equations in the numbers of nickels (n), dime (d), and quarters (q).
  n + d + q = 23 . . . . . . . there are 23 coins total
  0n +d -q = 2 . . . . . . . . .there are 2 more dimes than quarters
  5n +10d +25q = 250 . .the total value is $2.50

The collection includes 11 nickels, 7 dimes, and 5 quarters.

_____
I used the matrix function of my calculator to solve these equations. You can find q by subtracting from the last equation five times the sum of the first two equations.
  (5n +10d +25q) -5((n +d +q) +(d -q)) = (250) -5(23 +2)
  25q = 125 . . . . . . . simplify
  q = 5
From the second equation,
  d = q +2 = 7
And from the first,
  n = 23 -5 -7 = 11
You might be interested in
The radius of a circle is 7 millimeters. What is the circle's area?<br> r=7 mm<br> Use 3.14 for a.
givi [52]

Answer:

153.86

Step-by-step explanation:

formula - A = π × r2

3.14 x 7^2

= 153.86

4 0
2 years ago
Please help me……………………………………………………………
Irina18 [472]

Hey there! :)

Answer:

x = -6.

Step-by-step explanation:

Given:

\sqrt[3]{5x-4} = \sqrt[3]{7x + 8}

Cube both sides:

5x - 4 = 7x + 8

Subtract 5x from both sides:

-4 = 2x + 8

Subtract 8 from both sides:

-12 = 2x

x = -6.

3 0
3 years ago
10. For the equation 3x – 4 = 8, which
irga5000 [103]

Answer:

x  = 4

Step-by-step explanation:

We can find the answer to this by solving the equation:

3x - 4 = 8

3x - 4 + 4 = 8 + 4

3x = 12

x  = 4

6 0
3 years ago
Read 2 more answers
The area of the shape below I NEED HELP NOW
GalinKa [24]

Answer:

8 units squared

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Show me how to do this problem, 5550/ 10to the 3rd power
ICE Princess25 [194]
It should be 555^3=170953875
7 0
3 years ago
Read 2 more answers
Other questions:
  • Assume that random guesses are made for seven multiple choice questions on an SAT​ test, so that there are n=7 ​trials, each wit
    9·1 answer
  • What is the y- intercept of the line?​
    8·2 answers
  • Which is a different way to express 2(w + 3)?
    15·1 answer
  • What is the unit rate of the number of miles driven per number of hours of driving?
    10·1 answer
  • Find the value of x.
    12·1 answer
  • Help please, i have absolutely no idea how to do this :(
    8·1 answer
  • What is the rate of change from b to d? Group of answer choices 15/37 37/15 23/32 2/8
    6·1 answer
  • The class has 12 girls and 16 boys what is the ratio of total students to boys simplest form​
    14·2 answers
  • Choose all answers that apply
    6·2 answers
  • There is a pair of parallel sides in the following shape.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!