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
SCORPION-xisa [38]
3 years ago
8

A pile of 55 coins, consisting of nickels and dimes, is worth $3.90. find the number of each.

Mathematics
2 answers:
xz_007 [3.2K]3 years ago
8 0
<span>N + D = 55 coins (1) (N stands for nickels, 5N + 10D = 390 cents (2) D stands for dimes) Simplify (2) by canceling the factor 5 in both sides: N + 2D = 78 (3) Subtract eq(1) from eq(3). You will get D = 78 - 55 = 23. Answer. 23 dimes and 55-23 = 32 nickels. Check. 23*10 + 32*5 = 390 cents</span>
kari74 [83]3 years ago
7 0

N + D = 55 coins (1) (N stands for nickels, 5N + 10D = 390 cents (2) D stands for dimes) Simplify (2) by canceling the factor 5 in both sides: N + 2D = 78 (3) Subtract eq(1) from eq(3). You will get D = 78 - 55 = 23. Answer. 23 dimes and 55-23 = 32 nickels. Check. 23*10 + 32*5 = 390 cent

You might be interested in
What is the square root of 10
mart [117]

the square root of 10 would be 3.1

5 0
4 years ago
Read 2 more answers
What is the domain (plz answer)
DochEvi [55]

Answer:

go on socratice it helps alot just scan and your asnwer will pop up and done easy

3 0
4 years ago
Helppp!!<br><br> Identify the slope of the following equation:<br> -4x + 3y = 3
AlexFokin [52]

Answer:

the answer is -4

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Please answer 27 and 28
valina [46]

Answer:

27: 29.93 Seconds

28: 28 ° Fahrenheit

Step-by-step explanation:

Number #27:

Given:

#1 Lap = 14.76 seconds

#2 Lap = 15.17 seconds

Steps:

1. Use the algorithm method.

      1

14.76

+ 15.17

-------------

Answer: 29.93 seconds  

--------------------------------------------------------------------------------------

Number #28:

Given:

Wind Chill Temperature: - 18 ° F

Actual Temperature: 10 ° F

Steps:

1. Subtract 18 from 10.

Answer: - 28 ° degrees fahrenheit

Note: Whenever there is a negative sign next to a temperature, it means it's below freezing as the below freezing temperature is 0  ° Fahrenheit. This also means subtraction. In this case, you would subtract the negative amount from the positive amount creating an equation, that equation represents the degrees in fahrenheit:

10 - 18

The result should be -28.

This also means that the difference between both temperatures is 28 degrees. Wind chill creates a feeling of higher temperatures even though the actual temperature in the atmosphere was 10 ° F in this specific land structure.

Hope this helps,

-ROR

4 0
3 years ago
mariela is standing in a building and looking out a window at a tree. The tree is 20 feet away from Mariela, Mariela's line of s
PtichkaEL [24]

Answer: 30.01 feet.

Step-by-step explanation:

You need to remember this identity:

tan\alpha=\frac{opposite}{adjacent}

Observe the figure attached, where h_t is the height in feet of the tree.

You need to calculate h_1 of the Triangle 1, where:

\alpha= \alpha_1=42\°\\opposite=h_1\\adjacent=20

Substitute values into tan\alpha=\frac{opposite}{adjacent} and solve for h_1:

tan(42\°)=\frac{h_1}{20}\\\\h_1=20*tan(42\°)\\h_1=18

Now you need to calculate h_2 of the Triangle 2, where:

\alpha= \alpha_2=31\°\\opposite=h_2\\adjacent=20

Substitute values into tan\alpha=\frac{opposite}{adjacent} and solve for h_2:

tan(31\°)=\frac{h_2}{20}\\\\h_2=20*tan(31\°)\\h_2=12.01

Then the height in feet of the tree is:

h_t=h_1+h_2\\h_t=(18+12.01)ft\\h_t=30.01ft

5 0
3 years ago
Other questions:
  • What is the slope of the line segment?
    7·1 answer
  • Multiply: (-22)(38)<br> A)-836<br> B)-814<br> C)814<br> D)836
    11·1 answer
  • Which of the following is a rational number?
    11·2 answers
  • Pheonix ran 4.5 miles per hour for three fourths of an hour. How did Aliyah run today?
    8·1 answer
  • The number 66 is increased to 72. What is the percentage by which the number was increased, to the nearest tenth of a percent?
    5·1 answer
  • Solve the equation for the given variable <br> x + y = z ;x
    10·1 answer
  • 32) In a triangle, the exterior angle is twice of each of the interior remote angles. The exterior angle is 1200. Find the measu
    5·1 answer
  • On the coordinate plane shown, each grid unit represents 10 feet. Polygon QRST has vertices Q(10, 20), R(−10, 20), S(−10, −10),
    13·2 answers
  • Please help me- Math Sucks &gt;:(
    8·2 answers
  • If you make $18 an hour for straight time, what would your<br> overtime rate be?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!