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
timofeeve [1]
4 years ago
5

At a local store, kelly and martin bought some notebooks and pencils. Kelly bought 4 notebooks and 25 pencils for 16.71. Martin

bought 6 notebooks and 20 pencils for 21.74 what is the cost of 1 notebook and 5 pencils
Mathematics
1 answer:
Nat2105 [25]4 years ago
6 0
Let n = cost of 1 notebook
Let p = cost of 1 pencil

Then,

3n + 4p = 8.5
5n + 8p = 14.5

You can solve for one variable in terms of the other and then substitute into the remaining equation.

3n + 4p = 8.5
+ 5n + 8p = 14.5

Multiply the top equation by -2 so that the p-containing terms cancel each other out:

-2(3n + 4p = 8.5)
+ 5n + 8p = 14.5
-n + 0 = -2.5

So after dividing both sides by -1, we see that n = $2.5. Plugging into the first equation gives p = $0.25.


3n + 4p = 8.5
5n + 8p = 14.5
You might be interested in
Integration of (cosec^2 x-2005)÷cos^2005 x dx is
kondor19780726 [428]
We are asked in the problem to evaluate the integral of <span>(cosec^2 x-2005)÷cos^2005 x dx. The function is an example of a complex function with a degree that is greater than one and that uses special rules to integrate the function via the trigonometric functions. For example, we integrate 
2005/cos^2005x dx which is equal to 2005 sec^2005 x since sec is the inverse of cos. The integral of this function when n >3 is equal to I=</span><span>∫<span>sec(n−2)</span>xdx+∫tanx<span>sec(n−3)</span>x(secxtanx)dx
Then, 
</span><span>∫tanx<span>sec(<span>n−3)</span></span>x(secxtanx)dx=<span><span>tanx<span>sec(<span>n−2)</span></span>x/(</span><span>n−2)</span></span>−<span>1/(<span>n−2)I
we can then integrate the function by substituting n by 3.

On the first term csc^2 2005x / cos^2005 x we can use the trigonometric identity csc^2 x = 1 + cot^2 x to simplify the terms</span></span></span>
7 0
3 years ago
How far will fiona jog (in feet)
Aleksandr-060686 [28]

Answer:

1780 ft

Step-by-step explanation:

We need to find the perimeter of the rectangle, given by

P= 2(l+w)  where l is the length and w is the width

The units need to be the same

Change 230 yds to ft

230 yd * 3 ft/ y = 690 ft

P = 2(690+200)

P = 2(890)

P =1780

4 0
3 years ago
How can I find the difference of the median and mode
malfutka [58]
The median is 8 and the mode is 6, therefore the difference between the median and the mode is 2
6 0
3 years ago
Please help algebra II
Ann [662]

Answer:

If any horizontal line intersects the graph of f more than once, then f does not have an inverse. If no horizontal line intersects the graph of f more than once, then f does have an inverse. The property of having an inverse is very important in mathematics, and it has a name.

Step-by-step explanation:

7 0
3 years ago
Kevin is 4 times as old as Daniel and Kevin is <br> also 6 years older than Daniel
Brut [27]

Step-by-step explanation:

let kevein be x and daniel be y

x=4y (equation i)

x=6+y(equationii)

putting the value of x in equationii

4y=6+y

3x=6

x=2

5 0
2 years ago
Other questions:
  • Solve for x_____________________
    15·2 answers
  • Which of the following statement must be true about the diagram? Cheak all that apply.
    5·1 answer
  • Is 5.8 greater or less than fifty-eight hundredths
    9·1 answer
  • A package is dropped from a helicopter that is moving upward at 20.0 m/s. If it takes 18.0s before the package strikes the groun
    14·1 answer
  • Which equation shows a valid, practical step in solving?
    13·1 answer
  • Whats the probability of the sun setting tmrw? (in percentage)
    8·2 answers
  • Is 3/7 more or less than 1/2
    6·2 answers
  • You are biking to the park. After six minutes 40% of the distance still need to be traveled. How long does it take to bike to th
    12·1 answer
  • Pls help ASAP this table keeps going
    12·1 answer
  • HELP ME IN MATH PLEASE IM FAILING :( NO FAKE ANSWERS PLS :)
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!