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
kow [346]
3 years ago
9

Melissa is mailing packages. Each small package costs her

Mathematics
1 answer:
Gnoma [55]3 years ago
3 0
6x2.40=14.4
4.30x3=12.9
add.
12.90
14.40
=27.30
You might be interested in
The area of a triangle is found using the following formula:
attashe74 [19]

Answer:

12 in.2

Step-by-step explanation:

The formula for a triangle is b*h/2

3*8 = 24

24/2 = 12

3 0
3 years ago
Read 2 more answers
An automobile manufacturer who wishes to advertise that one of its models achieves 30 mpg (miles per gallon) decides to carry ou
Katyanochek1 [597]

Answer:

t=\frac{29.35-30}{\frac{1.365}{\sqrt{6}}}=-1.17  

p_v =P(t_{(5)}  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis.  

We can say that at 5% of significance the true mean is not significantly less than 30 so then the claim that true average fuel efficiency is (at least) 30 mpg makes sense

Step-by-step explanation:

Data given and notation  

The mean and sample deviation can be calculated from the following formulas:

\bar X =\frac{\sum_{i=1}^n x_i}{n}

s=\sqrt{\frac{\sum_{i=1}^n (x_i -\bar X)}{n-1}}

\bar X=29.35 represent the sample mean  

s=1.365 represent the sample standard deviation  

n=6 sample size  

\mu_o =30 represent the value that we want to test  

\alpha=0.05 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is lower than 30 or no, the system of hypothesis are :  

Null hypothesis:\mu \geq 30  

Alternative hypothesis:\mu < 30  

Since we don't know the population deviation, is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}} (1)  

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic  

We can replace in formula (1) the info given like this:  

t=\frac{29.35-30}{\frac{1.365}{\sqrt{6}}}=-1.17  

P-value  

We need to calculate the degrees of freedom first given by:  

df=n-1=6-1=5  

Since is a one-side left tailed test the p value would given by:  

p_v =P(t_{(5)}  

Conclusion  

If we compare the p value and the significance level given \alpha=0.05 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis.  

We can say that at 5% of significance the true mean is not significantly less than 30 so then the claim that true average fuel efficiency is (at least) 30 mpg makes sense

5 0
2 years ago
What is the simplified form of the expression -2(-5x - 8)?
Deffense [45]

Answer: 10x+16

Step-by-step explanation:

Use the distributive property a(b+c)= ab+ac

so

-2(-5x-8) = (-2 * -5x) - (-2* -8)

=

10x-(-16)

=10x+16

Hope this helped!

3 0
3 years ago
Please help me with this
Slav-nsk [51]

Answer:

21.....

Step-by-step explanation:

hope this helps

7 0
2 years ago
Read 2 more answers
PLS HELP WILL GIVE BRANLIEST
BartSMP [9]
The answer is A if I am correct
3 0
2 years ago
Other questions:
  • The capacity of a beaker is 150ml,how many beakers can be filled from a 4L Container ?
    12·1 answer
  • Evaluate f (2) if f (x)= 10-x^3
    8·1 answer
  • Kaitlin's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Kaitlin $5.50 per pound, and t
    7·1 answer
  • Kiara walks 8 1/2 blocks in 17 minutes. If kiara continues to walk at a steady pace, how many blocks will she walk each minute
    12·1 answer
  • Simplify (√3 − √7)^2
    6·1 answer
  • 4x-8x divided by 2
    15·1 answer
  • Erica wants to know how many books on average are in school libraries in her county. She randomly calls 50 school libraries in h
    12·2 answers
  • What is the answer to (4m-5) - (6m-7+2n)
    9·1 answer
  • <img src="https://tex.z-dn.net/?f=y%20%3D%20%20%5Cfrac%7Bx%20-%20r%7D%7Bx%20%2B%20r%3F%7D%20find%20%5C%3A%20the%20%5C%3A%20subje
    6·1 answer
  • A pattern is made from four congruent squares.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!