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
hammer [34]
3 years ago
15

Damien has 30 coins, all nickels and dimes. The total value of all these coins is $2.05. How many nickels does he have?

Mathematics
1 answer:
Damm [24]3 years ago
4 0

Hi there!

nickels:19

We know that there is only nickels and dimes in his coin collection..

<u><em>1.Multiply two terms:</em></u>

<u><em /></u>10<u><em>·</em></u>10=1.00<u><em /></u>

<u><em>Then there would be 20 nickels but 1+1=2 not 2.05.</em></u>

<u><em>2.Multiply the terms:</em></u>

<u><em /></u>11<u><em>·</em></u>10=1.10<u><em /></u>

<u><em /></u>19<u><em>·</em></u>5=0.95<u><em /></u>

<u><em>3.Combine the two terms:</em></u>

<u><em /></u>1.10+0.95=2.05<u><em /></u>

Therefore, there would be 19 nickels...

<u><em /></u>

You might be interested in
Calculate the area of parallelogram. <br><br>​
Nesterboy [21]

Answer:

84. What you did is right.

Step-by-step explanation:

A parallellogram's area is b x h. So the equation is 7 x 12=84.

8 0
3 years ago
Read 2 more answers
Which value or values would make this equation true? [?]=9
AlexFokin [52]
A. 9 only bc only 9 can be equal to 9 if it was absolutely value then the answer would be 9 and -9
6 0
3 years ago
A mass of 5 kg stretches a spring 10 cm. The mass is acted on by an external force of 10sin( t ) N(newtons) and moves in a mediu
yKpoI14uk [10]

Answer:

A) C1 = 0.00187 m = 0.187 cm,  C2 = 0.0062 m = 0.62 cm

B)  A sample of how the graph looks like is attached below ( periodic sine wave )

C) w = \sqrt[4]{3} is when the amplitude of the forced response is maximum

Step-by-step explanation:

Given data :

mass = 5kg

length of spring = 10 cm = 0.1 m

f(t) = 10sin(t) N

viscous force = 2 N

speed of mass = 4 cm/s = 0.04 m/s

initial velocity = 3 cm/s = 0.03 m/s

Formulating initial value problem

y = viscous force / speed = 2 N / 0.04 m/s = 50 N sec/m

spring constant = mg/ Length of spring = (5 * 9.8) / 0.1 = 490 N/m

f(t) = 10sin(t/2) N

using the initial conditions of u(0) = 0 m and u"(0) = 0.03 m/s to express the equation of motion

the equation of motion = 5u" + 50u' + 490u = 10sin(t/2)

A) finding the solution of the initial value

attached below is the solution and

B) attached is a periodic sine wave replica of how the grapgh of the steady state solution looks like

C attached below

3 0
3 years ago
A city map uses a scale in which 2.5 centimeters represents 3 kilometers. The distance on the map between the post office and th
marishachu [46]

Answer:

10.8 kilometers

6 0
3 years ago
2х - бу = 2<br>x + бу = 28​
scZoUnD [109]

Answer:

x = 10

y = 3

Step-by-step explanation:

Given

2x - 6y = 2

x + 6y = 28

Add both equations

2x + x -6y + 6y = 2 + 28

3x = 30

Divide both sides by 3

x = 30/3

x = 10

Substitute 10 for x in either equations to get y

Using equation 2 , we have

x + 6y = 28

10 + 6y = 28

Subtract 10 from both sides

10 - 10 + 6y = 28 - 10

6y = 18

Divide both sides by by 6

y = 18/6

y = 3

Therefore

x = 10

y = 3

7 0
3 years ago
Other questions:
  • What is the area of the parallelogram ?
    8·2 answers
  • Respond to this for 5 points! I know it's not that much but just respond anything you want &lt;3
    8·2 answers
  • In a multiple linear regression analysis, statistical model utility is determined by the value of R2 and 2s, while practical mod
    9·1 answer
  • What is the solution to the equation 1/3 (x - 2) = 1/5 (x + 4) + 2?
    8·2 answers
  • 2n-5(n+5)=8n+3(1-5n) what does n equal to
    14·2 answers
  • What is the value of y?
    13·1 answer
  • I need help with these two pls
    15·1 answer
  • Find the value of x.
    15·1 answer
  • Can you help me find X
    8·2 answers
  • The scale of a map says that 2 cm represents 8 km. What is the actual number of kilometers that is represented by 3 centimeters
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!