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
Phoenix [80]
4 years ago
10

WILL MARK BRAINIEST!!!!

Mathematics
1 answer:
OLga [1]4 years ago
7 0
y=ax^2+bx+c\\\\\text{if a}\ \textless \  \text{0 then a parabola op}\text{ening down}\\\\\text{if a}\ \textgreater \  \text{0 then a parabola op}\text{ening up}\\\\\text{We have}\ y=-x^2+2x+6\to a=-1 \ \textless \  0\\\text{a parabola op}\text{ening down}\to\text{the graph A and B}\\\\y=ax+b\\\\\text{if a}\ \textless \ \text{0 then a graph is decreasing}\\\text{if a}\ \textgreater \ \text{0 then a graph is increasing}\\\\\text{We have}\ y=2x-3\to a=2 \ \textgreater \  0\\\text{a graph is increasing}\to \text{the graph B and D}\\\\\text{Therefore your answer is B}
You might be interested in
A statistics instructor who teaches a lecture section of 160 students wants to determine whether students have more difficulty w
bulgar [2K]

Answer:

The null and alternative hypothesis are:

H_0: \mu_X-\mu_Y=0\\\\H_a:\mu_X-\mu_Y> 0

P-value=0.1996

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that the mean score μX on one-tailed hypothesis test questions is higher than the mean score μY on two-tailed hypothesis test questions .

Step-by-step explanation:

This is a hypothesis test for the difference between populations means.

The claim is that the mean score μX on one-tailed hypothesis test questions is higher than the mean score μY on two-tailed hypothesis test questions .

Then, the null and alternative hypothesis are:

H_0: \mu_X-\mu_Y=0\\\\H_a:\mu_X-\mu_Y> 0

The significance level is 0.05.

The sample X (one-tailed), of size nX=80 has a mean of 7.8 and a standard deviation of 1.06.

The sample Y (two-tailed), of size nY=80 has a mean of 7.64 and a standard deviation of 1.32.

The difference between sample means is Md=0.16.

M_d=M_X-M_Y=7.8-7.64=0.16

The estimated standard error of the difference between means is computed using the formula:

s_{M_d}=\sqrt{\dfrac{\sigma_X^2+\sigma_Y^2}{n}}=\sqrt{\dfrac{1.06^2+1.32^2}{80}}\\\\\\s_{M_d}=\sqrt{\dfrac{2.866}{80}}=\sqrt{0.036}=0.189

Then, we can calculate the t-statistic as:

t=\dfrac{M_d-(\mu_X-\mu_Y)}{s_{M_d}}=\dfrac{0.16-0}{0.189}=\dfrac{0.16}{0.189}=0.8453

The degrees of freedom for this test are:

df=n_1+n_2-1=80+80-2=158

This test is a right-tailed test, with 158 degrees of freedom and t=0.8453, so the P-value for this test is calculated as (using a t-table):

P-value=P(t>0.8453)=0.1996

As the P-value (0.1996) is greater than the significance level (0.05), the effect is not significant.

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that the mean score μX on one-tailed hypothesis test questions is higher than the mean score μY on two-tailed hypothesis test questions .

4 0
3 years ago
What is the vertex of the graph of the function f(x) = x2 + 10?
alexira [117]

Answer:

a

Step-by-step explanation:

5 0
3 years ago
Answer question below please
mr Goodwill [35]

Answer:

Homework

Step-by-step explanation

I got the answer by telling you to TRY and do your own homeowrk, Have you TRIED at least?!?!?

6 0
3 years ago
Read 2 more answers
lines A and B are parallel,lines x and y are transversals. if angle 2 is 57 degrees and angle 3 is 85 degrees,find the measure o
Stella [2.4K]

Answer:

<h2>38</h2><h2 />

Step-by-step explanation:

see attached

7 0
4 years ago
HELP IMMEDIATELY!!
salantis [7]

Answer: frist goes to second. Second goes to the third. Thrid goes to the frist.

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is 2 x 2 if u answer the right answer I will give u 98 points or even more if u want. :&gt;
    8·2 answers
  • Factor by grouping 4c^3+8c^2-9c-18
    15·1 answer
  • Justin purchased a 20 pound pumpkin for $9.80. How much did he pay per pound?
    9·1 answer
  • Helpppppppp plzzzzzzzzzzzz!
    6·2 answers
  • What is the expanded form of this number?
    10·1 answer
  • Pls pls PLEASE help me with this
    7·1 answer
  • Help!! Plz complete these two :)
    9·2 answers
  • For the equation: 2x + 7y + 6x - 3y + 4, choose the algebraic expression by combining like terms:
    10·2 answers
  • Find the rule. *
    6·1 answer
  • What is 9 times 5 /8? as a mixed number? somebody please help me find the answer!
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!