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
stich3 [128]
2 years ago
14

Kelly earned $20 for babysitting. She has also earned money by doing chores for 5 weeks. Altogether, she has earned $100. How mu

ch does she earn each week for doing chores?
a. $25
b. $20
c. $16
d. $10​
Mathematics
2 answers:
Studentka2010 [4]2 years ago
7 0
The answer is C, $16
NikAS [45]2 years ago
3 0

Answer:  16

Step-by-step explanation:

i did the math trust me

You might be interested in
PLEASE HELP QUICK I AM IN A RUSH
Alekssandra [29.7K]
C because it simplifies to 0=0 which proves that it has infinite solutions!
7 0
3 years ago
Read 2 more answers
I need help fast thank you
kondor19780726 [428]

Answer:

RO = 39.5

Step-by-step explanation:

RO/9 = 57/13

13RO = 513

RO = 513/13

RO = 39.46

5 0
2 years ago
Read 2 more answers
Bob has some 10 lb weights and some 3 lb weights. Together, all his weights add up to 50 lbs. If x represents the number of 3 lb
RUDIKE [14]
The equation would be 3x+10y=50.
7 0
2 years ago
A pair of opposite rays would be.
vodomira [7]

Answer:

Option (4)

Step-by-step explanation:

Definition of a ray states that a segments which connects two points but extending only in one direction infinitely is called as Ray.

Opposite rays will have a common end but the direction of the arrows will be different.

Therefore, from the picture attached,

Opposite rays will be PA and PB.

Option (4) will be the correct option.

7 0
3 years ago
A company with a large fleet of cars wants to study the gasoline usage. They check the gasoline usage for 50 company trips chose
Nookie1986 [14]

Answer:

The 95% confidence interval is given by (25.71536 ;28.32464)

And if we need to round we can use the following excel code:

round(lower,2)

[1] 25.72

round(upper,2)

[1] 28.32

And the interval would be (25.72; 28.32)  

Step-by-step explanation:

Notation and definitions  

n=50 represent the sample size  

\bar X= 27.2 represent the sample mean  

s=5.83 represent the sample standard deviation  

m represent the margin of error  

Confidence =88% or 0.88

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Calculate the critical value tc  

In order to find the critical value is important to mention that we don't know about the population standard deviation, so on this case we need to use the t distribution. Since our interval is at 88% of confidence, our significance level would be given by \alpha=1-0.88=0.12 and \alpha/2 =0.06. The degrees of freedom are given by:  

df=n-1=50-1=49  

We can find the critical values in R using the following formulas:  

qt(0.06,49)

[1] -1.582366

qt(1-0.06,49)

[1] 1.582366

The critical value tc=\pm 1.582366  

Calculate the margin of error (m)  

The margin of error for the sample mean is given by this formula:  

m=t_c \frac{s}{\sqrt{n}}  

m=1.582366 \frac{5.83}{\sqrt{50}}=14.613  

With R we can do this:

m=1.582366*(5.83/sqrt(50))

m

[1] 1.304639

Calculate the confidence interval  

The interval for the mean is given by this formula:  

\bar X \pm t_{c} \frac{s}{\sqrt{n}}  

And calculating the limits we got:  

27.02 - 1.582366 \frac{5.83}{\sqrt{50}}=25.715  

27.02 + 1.582366 \frac{5.83}{\sqrt{50}}=28.325

Using R the code is:

lower=27.02-m;lower

[1] 25.71536

upper=27.02+m;upper

[1] 28.32464

The 95% confidence interval is given by (25.71536 ;28.32464)  

And if we need to round we can use the following excel code:

round(lower,2)

[1] 25.72

round(upper,2)

[1] 28.32

And the interval would be (25.72; 28.32)  

6 0
3 years ago
Other questions:
  • Staci is attending a music festival. The ticket to the festival costs $87.96 . Staci plans to purchase $30.00 t-shirts from the
    8·1 answer
  • if angle A and angle B are complementary angles and measure angle A =2 measure angle B find measure angle A and measure angle B
    9·1 answer
  • Omar is on a diet to lose some weight. He is losing weight at a rate of 2 pounds per week. After 6 weeks, his weight is 204 poun
    12·1 answer
  • What are the proofs
    15·1 answer
  • 5<br> Find x to the nearest tenth.<br> 18.7<br> 13<br> 19.3<br> NEXT QUESTION<br> © ASK FOR HELP
    9·1 answer
  • Can anyone help me please?
    11·2 answers
  • 22 What is the circumference of the circle? Use 7 for yr. 35 cm 44 cm 55 cm​
    10·1 answer
  • A 12 ft ladder reaches 9ft up a wall. What is the angle formed between the ladder and the ground?
    14·1 answer
  • Find the slope of the line (0,7), (4,4)
    6·1 answer
  • Estimate 530x375. Is the estimated product closer to 150,000 or 200,000? Explain.
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!