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
Eduardwww [97]
3 years ago
6

 Sandra sells necklaces at a school craft fair. She uses the equation P= 7.5n - (2.25n + 15) to determine her total profit at th

e fair. Based on this equation, how much does she charge for each necklace?
A. $2.25
B. $7.50
C. $15.00
D. $17.25

This question has been posted with answers...but I am not in understanding. Would someone mind explaining WHY the answer is $7.50? Why wouldn't it be $2.25?
Mathematics
1 answer:
gregori [183]3 years ago
8 0
The way you find profit is to subtract the revenue and the cost
Profit = Revenue - Cost
The revenue is the amount of money coming in, the cost is the amount of money going out. The goal of course is to have the revenue larger than the cost so that the profit is positive. 

So the equation given is
P = 7.5n - (2.25n+15)
and its in the form
P = R - C
where...
R = 7.5n is the revenue equation
C = 2.25n+15 is the cost equation

Focus on the revenue equation
R = 7.5n
which is the same as 
R = 7.50*n

This tells us that Sandra pulls in a total of 7.50*n dollars where n is some positive whole number. It represents the number of necklaces sold. For example, if she sold n = 10 necklaces, then
R = 7.50*n
R = 7.50*10
R = 750
meaning that Sandra has made $750 in revenue

As you can see above, the revenue is computed by multiplying the price per necklace ($7.50) by the number of necklaces sold (n) to get R = 7.50*n

So that's why the answer is $7.50

Note: The 2.25 is part of the cost equation. This is known as the variable cost. It is the cost to make one necklace ignoring the fixed cost (eg: rent). The variable cost often doesn't stay the same, but algebra textbooks often simplify this aspect. 
You might be interested in
A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly se
Darina [25.2K]

Answer: (17.42, 20.78)

Step-by-step explanation:

As per given , we have

Sample size : n= 9

\overline{x}=19.1 years

Population standard deviation is not given , so it follows t-distribution.

Sample standard deviation : s= 1.5 years

Confidence level : 99% or 0.99

Significance level : \alpha= 1-0.99=0.01

Degree of freedom : df= 8  (∵df =n-1)

Critical value : t_c=t_{(\alpha/2,\ df)}=t_{0.005,\ 8}= 3.355

The 99% confidence interval for the population mean would be :-

\overline{x}\pm t_c\dfrac{s}{\sqrt{n}}

19.1\pm (3.355)\dfrac{1.5}{\sqrt{ 9}}\\\\=19.1\pm1.6775\\\\=(19.1-1.6775,\ 19.1+1.6775)\\\\=(17.4225,\ 20.7775)\approx(17.42,\ 20.78)

Hence, the 99% confidence interval for the population mean is (17.42, 20.78) .

7 0
3 years ago
Please help I will mark as brainliest
MrMuchimi

Answer:

no

Step-by-step explanation:

3 0
3 years ago
An angle measuring 3.6 radians is drawn in standard position?
tester [92]

Answer:

III

Step-by-step explanation: I just took the quiz

6 0
3 years ago
What is the solution to the equation 1/4x = 5?
puteri [66]
The solution to your equation is:

Solve:
1/4x = 5

Step 1: Multiply both sides by 4
4 * (1/4x) = (4) * (5)

x = 20


Thus your answer is:

Letter Choice (C), x = 20





Hope that helps!!!



5 0
3 years ago
Pls pls plz plz pls help
Citrus2011 [14]

Answer:

x is 24°

Step-by-step explanation:

angles substended by the same chord or arc....90-66= 24°.

5 0
2 years ago
Other questions:
  • How to find the derivative of this function?
    11·1 answer
  • The diameter of the sun is 1.391 million kilometers. Represent this number in scientific numbers.
    6·2 answers
  • How many of these integers are not divisible by 5 or 6?
    11·1 answer
  • Simplify (x + 2/ x^2 + 2x -3) / (x + 2/x^2 - x)
    15·2 answers
  • Question is in the picture
    13·2 answers
  • A camping ground began with 240 pounds of food and each day consumed about 12 pounds. After how many days did they have 180 poun
    6·2 answers
  • On Tuesday at lunchtime, it was 29 degrees Celsius. By sunset, the temperature had dropped to 16 degrees Celsius. Please write a
    7·1 answer
  • A restaurant owner has found that 80% of her customers return to the restaurant within two weeks. She wants to create a tool tha
    13·2 answers
  • 20 points! Write an exponential function in the form y=ab^x that goes through points (0, 8) and (2, 200)
    5·2 answers
  • Pleas help me, i'm not sure which one it is and i think it is 10 students got off the bus every minute, please let me know if i'
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!