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
Radda [10]
3 years ago
7

If a line has a slope of 2 and contains the point (-2,1), what is its equation in point-slope form?

Mathematics
1 answer:
kondaur [170]3 years ago
5 0
The equation for slope is y=mx+b. slope is m. 2 is the slope. so you know the m part of the equation is 2. just by eliminating the answers that don’t have 2 as the slope, A is your answer.
You might be interested in
A paper describes a study in which researchers observed wait times in coffee shops in Boston. Both wait time and gender of the c
kvasek [131]

Answer:

t=\frac{85.8-113.4}{\sqrt{\frac{(50)^2}{145}+\frac{(75)^2}{141}}}}=-3.65  

p_v =2*P(t_{(284)}

Using Excel we can use the following code: "=2*T.DIST(-3.65;284;TRUE)"

So the p value is a very low value and using any significance level giveen \alpha=0.05 always p_v so we can conclude that we have enough evidence to reject the null hypothesis, and there is enough evidence to conclude that the means are different.

Step-by-step explanation:

1) Data given and notation

\bar X_{M}=85.8 represent the mean for the males

\bar X_{F}=113.4 represent the mean for females

s_{M}=50 represent the sample standard deviation for males

s_{F}=75 represent the sample standard deviation for female

n_{M}=145 sample size for the group poisoned

n_{F}=141 sample size for the group unpoisoned

t would represent the statistic (variable of interest)

2) Concepts and formulas to use

We need to conduct a hypothesis in order to check if the mean for the two groups are equal or not , the system of hypothesis would be:

Null hypothesis:\mu_{M} = \mu_{F}

Alternative hypothesis:\mu_{M} \neq \mu_{F}

If we analyze the size for the samples both are higher than 30 but the population deviations are not given, so for this case is better apply a t test to compare means, and the statistic is given by:

t=\frac{\bar X_{M}-\bar X_{F}}{\sqrt{\frac{s^2_{M}}{n_{M}}+\frac{s^2_{F}}{n_{F}}}} (1)

t-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.

3) Calculate the statistic

We can replace in formula (1) the results obtained like this:

t=\frac{85.8-113.4}{\sqrt{\frac{(50)^2}{145}+\frac{(75)^2}{141}}}}=-3.65  

4) Statistical decision

The first step is calculate the degrees of freedom, on this case:

df=n_{M}+n_{F}-2=145+141-2=284

Since is a two tailed test the p value would be:

p_v =2*P(t_{(284)}

Using Excel we can use the following code: "=2*T.DIST(-3.65;284;TRUE)"

So the p value is a very low value and using any significance level giveen \alpha=0.05 always p_v so we can conclude that we have enough evidence to reject the null hypothesis, and there is enough evidence to conclude that the means are different.

4 0
3 years ago
Peter earns $12.40 each week for doing his chores .Ria earns 1.2 times as much money per week as Peter. How much do Ria earn eac
steposvetlana [31]

Answer:

$14.88

Step-by-step explanation:

Ria earns 1.2 times more than Peter does

Peter earns $12.40

To solve, you have to multiply the amount peter has by 1.2

12.40(1.2) = 14.88

Therefore, Ria earns $14.88

8 0
2 years ago
Farmer Ed has 150 meters of fencing and wants to enclose a rectangular play that borders a river. If farmer Ed does not fence in
dexar [7]
150/3=50

50^2=2500m^2=largest area
7 0
3 years ago
Read 2 more answers
I need help with this problem
Sergio [31]

-1+0+2+1-2-1-1+2-1

-1  +  3  -  3  +  1  -  1

   2  -  2  -  1

         -1

5 0
3 years ago
Read 2 more answers
The question is what is the surface area of the three dimensional figure the choices are
Yuki888 [10]

Answer:

im not sure about this one but i think its 2. 180ft squared

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • What percent is equivalent to 2/3?
    7·2 answers
  • Mary ran 3/4 mile, Lila ran 2/3 mile, and sue ran 3/8 mile.Who ran the farthest?Draw a diagram to solve.
    12·1 answer
  • How do you find the solutions of the equation 2sin^2(x)=1
    5·1 answer
  • Princeton caught 42 fish this summer, which is 70% of the number of fish his friend Trenton caught. How many fish did Trenton ca
    9·1 answer
  • Your baseball team has a goal to collect at least 160 blankets for a shelter. Team members brought 42 blankets on Monday and 65
    12·1 answer
  • Can i get help on 23?
    13·2 answers
  • Do you know this ?!?!!??!?!!!!!?!?
    12·1 answer
  • 52 degrees times x+56 time 78 degrees please help quickly WILL MARK BRAINLESS
    7·1 answer
  • Please help!! I need the answer and the explanation on how to do this
    6·1 answer
  • In ΔTUV, u = 330 inches, t = 800 inches and ∠T=53°. Find all possible values of ∠U, to the nearest degree.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!