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
quester [9]
3 years ago
7

A box of 80 coins, consisting of only nickels and dimes, is worth 7 dollars and 80 cents. Find the number of nickels.

Mathematics
1 answer:
Zepler [3.9K]3 years ago
8 0
4 nickles
Explanation:
80=N+D
7.80=0.05N + 0.1D

D=80-N

7.80=0.05N + 0.1(80-N)
7.80=0.05N + 8 - 0.1N
0.1N + 7.80 = 8 + 0.05N
0.05N = 8-7.80
0.05N = 0.2
N= 4
You might be interested in
Which set of ordered pairs in the form of (x,y) does not represent a function of x? {(-1,2), (3,-2),(0,1),(5,2}
serg [7]
For a relation to be a function it must be one-to-one or many-to-one.

One-to-many relation is not a function.

In the above options, C is One-to-many relation therefore cannot be a function.

The reason is that 3 alone maps onto -2 and 5, in the ordered pairs (3,-2) and (3,5). This disqualifies it from being a function.

Hence the graph of this relation will not pass the vertical line test

The correct answer is C
5 0
3 years ago
The area of a square piece of land is 784metersquared .What is the perimeter​
Marta_Voda [28]

Answer:

112 m

Step-by-step explanation:

The area (A) of a square is

A = s² ( s is the length of side )

Here A = 784 , then

s² = 784 ( take the square root of both sides )

s = \sqrt{784} = 28

Then

perimeter = 4s = 4 × 28 = 112 m

7 0
3 years ago
Read 2 more answers
Find the slope of the line that passes through these two points: (- 1, 0) and (4, - 2) .
I am Lyosha [343]
Slope is vertical change over horizontal change. Since coordinates conveniently give both the horizontal and vertical coordinates of a points, we can use the coordinates of both points to differentiate, or find the change horizontally and the change vertically between the two points.
8 0
3 years ago
What is the 28% of 349 multiplied by 7
Oxana [17]

Answer:

Step-by-step explanation:

<h2>E X P L A N A T I O N</h2>
3 0
3 years ago
Read 2 more answers
Which system of inequalities has a solution set that is a line?
Korolek [52]

We're going to solve each of the systems to determine the solution.

<u>System 1</u>

x+y \geq  3\\ x+y \leq  3

using a graph tool

the solution is the line x+y=3

see the attached figure N 1

<u>System 2</u>

x+y \geq  -3\\ x+y \leq  3

using a graph tool

the solution is the shaded area

see the attached figure N 2

<u>System 3</u>

x+y >  3\\ x+y <  3

using a graph tool

The system has no solution

see the attached figure N 3

<u>System 4</u>

x+y >  -3\\ x+y <  3

using a graph tool

the solution is the shaded area

see the attached figure N 4

therefore

<u>the answer is</u>

<u>System 1</u>

x+y \geq  3\\ x+y \leq  3



7 0
4 years ago
Read 2 more answers
Other questions:
  • Write a situation in which positive and negative numbers are used to describe values that have the opposite meaning.
    11·1 answer
  • The velocity of a skydiver t seconds after jumping is given by V(t)= 80(1-e^-.2t). After how many seconds is the velocity 120 ft
    9·1 answer
  • -3(10+-5)/(10-(-5))^2
    6·1 answer
  • What is the measure of A? I’m confused Please help me!!
    13·1 answer
  • What is the answer to 5-20/3 ?
    8·2 answers
  • PLEASE HELP!!! I tried everything from dividing, adding, subtracting, multiplying, you name it but I can not seem to get the cor
    9·2 answers
  • What is the median for this list of numbers? 2, 5, 8, 9, 11, 3
    15·1 answer
  • Which of these shows the result of using the first equation to substitute for y in the second equation, then combining like term
    7·1 answer
  • Veuillez m’aider s’il vous plaît à résoudre cette question merci !
    9·1 answer
  • Three friends in Seattle each told you it’s rainy, and each person has a 1/3 probability of lying. What is the probability that
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!