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
lisov135 [29]
1 year ago
10

At 7-11, I get my change from a Slurpee in all nickels and pennies. If I get $0.87 in change, and a total of 31 coins, how many

of each coin did I get in change? For full credit, use an algebraic method here!
Mathematics
1 answer:
Elena-2011 [213]1 year ago
7 0

Given:

The change all in nickels and pennies.

Let the number of nickels = x

Let the number of pennies = y

Total coins = 31

so, x + y = 31

1 nickel = 5 cents

1 penny = 1 cent

The change = $0.87 = 87 cents

so, 5x + y = 87

so, we have the following system of equations:

\begin{gathered} x+y=31\rightarrow(1)\times-1 \\ 5x+y=87\rightarrow(2) \\ ------------- \\ (5x-x)+(y-y)=87-31 \\  \\ 4x=56 \\  \\ x=\frac{56}{4}=14 \\  \\ y=31-14=17 \end{gathered}

So, the number of nickels = x = 14

And the number of pennies = y = 17

You might be interested in
......ssssssssssssssssssssssssssssssssssssshhhhhh
Darina [25.2K]

Hey there! I'm happy to help!

Step 2 is incorrect. She added 4 and 2 first, but you are supposed to multiply and divide first. Then she multiplied 6 and 6, which is 36. Then she divided 36 and 2, which is 18, and then she subtracted 7, giving her 11. Step 2 is what threw the whole thing off.

Here is what Sandy should have done.

STEP 1: 6·4+2÷2-7

STEP 2: 24+1-7

STEP 3: 25-7

STEP 4: 18

I hope that this helps! Have a wonderful day! :D

3 0
3 years ago
Read 2 more answers
0<br> 류<br> In<br> +<br> 0<br> 4<br> 1<br> 6<br> 1<br> Which fraction is equal to<br> 좋
Diano4ka-milaya [45]

Answer:

B = 6/8

Step-by-step explanation:

3 x 2 = 6

____ __

4 x 2 8

(Equivalent fraction)

5 0
3 years ago
A room has a cathedral ceiling. If the walls in the room are 10 feet high and the ceiling is 18 feet high in the center of the r
9966 [12]
Check the picture below

notice, the run is half 35

recall slope = rise/run

4 0
3 years ago
Find the solution of the system of equations.<br> 10x+10y=40 <br> 5x+3y=8
ddd [48]

Answer:

x = -2 & y = 6

Step-by-step explanation:

10x+10y=40

10x+10y+ -10y=40+-10y

10x=-10y+40

\frac{10x}{10} =\frac{-10y+40}{10}

x=-y+4

5x+3y=8

5(-y+4)+3y=8

-2y+20=8

-2y+20+-20=8+-20

-2y=-12

\div2

y=6

x=-y+4

x=-6+4

x=-2

Hope this helps.

7 0
2 years ago
Please help A B C OR D​
AlexFokin [52]

Answer:

d

Step-by-step explanation:

8 0
2 years ago
Other questions:
  • A clothing store orders 15 boxes of shirts to restock their shelves. There are 125 shirts in each box. How many shirts does the
    12·2 answers
  • 23. Two coins are tossed. Alan gets a point if the coins match and Sondra gets a point if they do not match.
    11·2 answers
  • Ben scores 56 out of 79 what is his percentage to the nearest decimal spac
    6·1 answer
  • An integer 3a5b can be divided by 5 and 6, what is the value of a + b.
    5·1 answer
  • Please Help!!!
    8·1 answer
  • Easy answer!!!! Will give brainliest
    6·1 answer
  • A city manager made a scatter plot of the number or retail store in a certain city over the years. the scatter plot had a trend
    11·1 answer
  • Find integral∫cos³x dx) )?​
    14·2 answers
  • Which property was used to simplify the expression?
    5·1 answer
  • On a number line, between which two consecutive whole numbers would √221 be located? Use pencil and paper. Explain why it might
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!