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
Dmitriy789 [7]
2 years ago
14

Two cartons of milk and one sandwich costs $3.00, and two sandwiches cost $4.20 without milk. Find the cost of one carton of mil

k.
Mathematics
2 answers:
Mkey [24]2 years ago
6 0

Answer:

$0.45 or 45 cents

Step-by-step explanation:

Let x = carton of milk

     y = sandwich

2x + y = 3

2y = 4.2

Let's use the substitution method to solve this

First, divide both sides by 2 in the second equation

2y/2 = 4.2/2

y = 2.1

Substitute the new y into the first equation

2x + 2.1 = 3

Now subtract 2.1 from both sides

2x + 2.1 = 3

     - 2.1   - 2.1

2x = 0.9

Divide both sides by 2 to isolate the x variable

2x/2 = 0.9/2

x = 0.45

morpeh [17]2 years ago
5 0

Answer:

0.90 cents

Step-by-step explanation:

one sandwich costs $2.10

so subtract that from the $3.00

which is $0.90

You might be interested in
What is the exact area of a circle whose radius is 9 yd? Enter your answer in the box. Express your answer in terms of
atroni [7]

Answer:

81\pi

Step-by-step explanation:

Area = pi*r^2

Area = pi*9^2

Area = 81\pi

6 0
3 years ago
Read 2 more answers
Can someone help please
Ymorist [56]

Answer:it is 7 and 6 that is your answer if that does not work it is 12 and 13 ok.

8 0
3 years ago
You go shopping at a local department store with your friend and cousin. You buy one pair of jeans, four pairs of shorts, and tw
VashaNatasha [74]

Answer: Cost per pair of jeans = $ 20

Cost per pair of shorts = $12

Cost per shirt = $8

Step-by-step explanation:

Let x= cost per pair of jeans

y = Cost per pair of shorts

z= cost per shirt.

For you, total cost = x+4y+2z= 84

For your friend,  total cost = 2x+y+3z=76

For cousin, total cost = x+2y+z= 52

Required system:

x+4y+2z=84\ (i)\\ 2x+y+3z=76\ (ii)\\ x+2y+z=52\ (iii)

from (i), x=84-4y-2z    (*)

put this in (ii) and (iii) we get

2\left(84-4y-2z\right)+y+3z=76\\\Rightarrow\ -7y-z+168=76\ (iv)\\\\ 84-4y-2z+2y+z=52\\\Rightarrow\ -2y-z+84=52 \ (v)

from (iv), y=-\frac{z-92}{7}\ (vi)

\mathrm{Subsititute\:}y=-\frac{z-92}{7}\ \text{in}\ (v)

-2\left(-\frac{z-92}{7}\right)-z+84=52\\\\\Rightarrow\ -2\left(-\frac{z-92}{7}\right)-z=-32\\\\\Rightarrow\ -\frac{5z}{7}-\frac{184}{7}=-32\\\\\Rightarrow\ -5z-184=-224\\\\\Rightarrow\ -5z=-40\\\\\Rightarrow\ z=8

\mathrm{Subsititute\:}z=8\text{ in (vi)}

y=-\frac{8-92}{7}\\\\\Rightarrow \ y=12

\mathrm{Subsititute\:}z=8,\:y=12\text{ in (*)}

x=84-4\cdot \:12-2\cdot \:8\\\\\Rightarrow\ x= 20

Hence, x= 20, y= 12 , z=8

So, Cost per pair of jeans = $ 20

Cost per pair of shorts = $12

Cost per shirt = $8

7 0
3 years ago
A low P-Value in ANOVA table mean that the population mean of each treatment effects are different. the population mean of at le
Verizon [17]

Answer:

The population mean of at least one treatment effect are different.

Step-by-step explanation:

An analysis of variance (ANOVA) is conducted in order to determine if there are significant differences between the values of the population mean with respect to the response variable for the domains that under the effects of different treatments. A low p-value leads to reject the null hypothesis of the following hypothesis system:

H_0: \mu_1=\mu_2=...=\mu_k\\\\\\H_a: \mu_i \neq\mu_j, for $ for some i, j between 1 and k.$

Rejecting H0 means that this hypothesis is false and, in turn, allows us to conclude that the population mean of one of the domains is different from the others.

4 0
3 years ago
The price of a cup of coffee has dropped to $2.10 today. Yesterday's price was $2.35 . Find the percentage decrease. Round your
Lady bird [3.3K]
Percent increase/decrease is: (Change/original amount)x100 (.25/2.35)x100= 10.6%
6 0
3 years ago
Other questions:
  • Find the value of x.
    5·2 answers
  • What is the slope of the line represented by the equation 5x – 4y = 24?
    13·2 answers
  • A company spend $2,415 on plane tickets for 7 employees. All the tickets cost the same amount. How much did each ticket cost?
    7·2 answers
  • Write an inequality to represent the phrase: The sum of a number and 7 is no more than 53.
    15·2 answers
  • Luis found a new text messaging plan which will charge him $2.00 for 80 messages. Using this plan, how much would he pay for 900
    9·1 answer
  • If correct I’ll give brainlist
    6·2 answers
  • What is an equation for the line through (11,-21) with undefined slope​
    15·1 answer
  • Please help with math !!!!!!!!! will give brainliest if you do all....
    7·2 answers
  • FIND B ONLY<br>WILL GET BRAINLIEST ​
    7·1 answer
  • What is the missing pattern 7, 11, 2, 18, -7
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!