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
lapo4ka [179]
3 years ago
10

A collection of nickels, dimes, and quarters consist of 18 18 coins with a total of $ 2.05 $2.05. if the number of dimes is equa

l to the number of nickels, find the number of each type of coins.
Mathematics
1 answer:
ladessa [460]3 years ago
6 0
The first thing we must do for this case is to define variables.
 We have then:
 x = the number of nickels
 y = the number of dimes
 z = the number of quarters
 We write the system of equations:
 0.05x + 0.1y + 0.25z = 2.05
 x + y + z = 18
 x = y
 Solving the system we have:
 x = 7
 y = 7
 z = 4
 Answer:
 
nickels = 7
 
dimes = 7
 
quarters = 4
You might be interested in
What is the image of the point (-1,-3)(−1,−3) after a rotation of 90 degrees counterclockwise about the origin?
ycow [4]

Answer:

(3,-1)

Step-by-step explanation:

6 0
3 years ago
Scores on the Wechsler intelligence quotient (IQ) test are normally distributed with a mean score of 100 and a standard deviatio
rosijanka [135]
15.87% of the population does not meet the minimum standards.

We use z-scores to find this probability:

z=(X-μ)/σ = (85-100)/15 = -15/15 = -1

Using a z-table (http://www.-table.com) we see that the area to the left of, less than, this is 0.1587.  This is 15.87%.
5 0
3 years ago
Please help me !!!!!!​
zlopas [31]

Answer:

okay!

Step-by-step explanation:

its B

5 0
2 years ago
Read 2 more answers
A basin is filled by two pipes in 12 minutes and 16 minutes respectively. Due to the obstruction of water flow after the two pip
olasank [31]

Answer:

The time duration of the two pipes restricted flow before the flow became normal is 4.5 minutes

Step-by-step explanation:

The given information are;

The time duration for the volume, V, of the basin to be filled by one of the pipe, A, = 12 minutes

The time duration for the volume, V, of the basin to be filled by the other pipe, B, = 16 minutes

Therefore, the flow rate of pipe A = V/12

The flow rate of pipe B = V/16

Due to the restriction, we have;

The proportion of its carrying capacity the first pipe, A, carries = 7/8 of the carrying capacity

The proportion of its carrying capacity the second pipe, B, carries = 5/6 of the carrying capacity

Whereby the tank is filled 3 minutes after the restriction is removed, we have;

\dfrac{7}{8} \times \dfrac{V}{12} \times t + \dfrac{5}{6} \times \dfrac{V}{16} \times t +  \dfrac{V}{12} \times 3 + \dfrac{V}{16} \times 3 = V

Simplifying gives;

\dfrac{(2\cdot t +7) \cdot V}{16}  = V

2·t + 7 = 16

t = (16 - 7)/2 = 4.5 minutes

Therefore, it took 4.5 seconds of the restricted flow before the the flow of water in the two pipes became normal

7 0
3 years ago
Read 2 more answers
Find f(h(-1))<br> 2<br> -9<br> 11<br> -11
kumpel [21]

Answer:

  (d)  -11

Step-by-step explanation:

Each of the functions is evaluated in the usual way: put the number where the variable is in the expression and simplify.

  h(-1) = -2(-1)² -3(-1) +1 = -2 +3 +1 = 2

  f(2) = (2(2) +7)/(2 -3) = 11/-1 = -11

Then f(h(-1)) is ...

  f(h(-1)) = f(2) = -11

5 0
2 years ago
Other questions:
  • Part A: Abe rented a bike at $36 for 5 days. If he rents the same bike for 8 days, he has to pay a total rent of $48. Write an e
    11·1 answer
  • List three different ways to write 5^11 as the product of two powers. Explain why all three of your expressions are equal to 5^1
    8·1 answer
  • Solve for x 3x-3&gt;x+7
    9·1 answer
  • Describe the transformation that maps the pre-image (^A) to the image (^A).
    10·1 answer
  • What is 7/8 - 2/7 in the simplest form
    6·1 answer
  • OVERDUE PLEASE HELP OR I’LL CRY
    11·1 answer
  • 2.5 = x/2. What is x? (x/2 is a fraction)
    7·1 answer
  • Compute the balance of $12,000 invested at APR of 4.4% for 18 yrs​
    5·1 answer
  • Can someone please help
    14·1 answer
  • Please help I don’t understand this
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!