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
german
3 years ago
5

BRAINLIST and POINTS help

Mathematics
2 answers:
dimaraw [331]3 years ago
8 0

Answer:

58

Step-by-step explanation:

9*a=63-b=58

because a=7 and b=5

brainliest?

Ksju [112]3 years ago
6 0
Answer : 58
9•a=63-b=58
because a=7 and b=5
You might be interested in
In a completely randomized experimental design, three brands of paper towels were tested for their ability to absorb water. Equa
arlik [135]

Answer:

Yes. At this significance level, there is evidence to support the claim that there is a difference in the ability of the brands to absorb water.

Step-by-step explanation:

<em>The question is incomplete:</em>

<em>The significance level is 0.05.</em>

<em>The data is:</em>

<em>Brand X: 91, 100, 88, 89</em>

<em>Brand Y: 99, 96, 94, 99</em>

<em>Brand Z: 83, 88, 89, 76</em>

We have to check if there is a significant difference between the absorbency rating of each brand.

Null hypothesis: all means are equal

H_0:\mu_x=\mu_y=\mu_z

Alternative hypothesis: the means are not equal

H_a: \mu_x\neq\mu_y\neq\mu_z

We have to apply a one-way ANOVA

We start by calculating the standard deviation for each brand:

s_x^2=30,\,\,s_y^2=6,\,\,s_z^2=35.33

Then, we calculate the mean standard error (MSE):

MSE=(\sum s_i^2)/a=(30+6+35.33)/3=71.33/3=23.78

Now, we calculate the mean square between (MSB), but we previously have to know the sample means and the mean of the sample means:

M_x=92,\,\,M_y=97,\,\,M_z=84\\\\M=(92+97+84)/3=91

The MSB is then:

s^2=\dfrac{\sum(M_i-M)^2}{N-1}\\\\\\s^2=\dfrac{(92-91)^2+(97-91)^2+(84-91)^2}{3-1}\\\\\\s^2=\dfrac{1+36+49}{2}=\dfrac{86}{2}=43\\\\\\\\MSB=ns^2=4*43=172

Now we calculate the F statistic as:

F=MSB/MSE=172/23.78=7.23

The degrees of freedom of the numerator are:

dfn=a-1=3-1=2

The degrees of freedom of the denominator are:

dfd=N-a=3*4-3=12-3=9

The P-value of F=7.23, dfn=2 and dfd=9 is:

P-value=P(F>7.23)=0.01342

As the P-value (0.013) is smaller than the significance level (0.05), the null hypothesis is rejected.

There is evidence to support the claim that there is a difference in the ability of the brands to absorb water.

3 0
3 years ago
Decide whether the two expressions are equivalent for each problem below.
Vesnalui [34]

Answer:

Step-by-step explanation:

6 0
2 years ago
Graph: y = 3x - 5<br> Plz help
nexus9112 [7]

Answer:

The equation, y=3x-5 is in y=mx+b format. The b, or -5 in this case, tells you what the y intercept is, or in this case, your starting point. This means your first point will be at (0,-5). The mx, or 3x in this case, tell us how much to move     up and how much to move sideways. 3x is equal to 3/1x and the 3/1 tells us the rise/run. Rise being how much to go up or down and run being how much to go to the left or right. So in 3x, the rise is 3 and the run is 1. So you will go 3 up on the y axis and 1 to the right on the x-axis. So your next point will be (1, -2) and the point after that will be (2, 1) and so on!

hope this helped!

5 0
3 years ago
Read 2 more answers
A diabetes drug cost $78 online. This cost is 75% of the cost of the
alexgriva [62]

Answer:

$104

Step-by-step explanation:

If the cost in the store is x we can write:

75%x = 78

0.75x = 78

x = 78 / 0.75 = 104

5 0
3 years ago
Read 2 more answers
Please help!! :) .....
Inessa05 [86]

Answer:

*helps*

Step-by-step explanation:

done (:P)

6 0
3 years ago
Other questions:
  • A triangle has vertices A(-4,2), B(-2,3) and C(0,2). Find the vertices of the triangle if it is reflected over the x- axis and t
    10·1 answer
  • The face of the triangular concrete panel shown has an area of 22 square meters, and its base is 3 meters longer than twice its
    14·1 answer
  • What is the range of 53, 63, 65, 66, 74, 81, 87?
    12·2 answers
  • 1) What is the probability that a student prefers comedy, given that the student is in 10th grade?
    14·1 answer
  • Chakan worked at the warehouse after school. He earned $9.25 per hour stacking boxes. Which equation correctly relates Chakan’s
    9·1 answer
  • How to prove converse of. basic proportionality theorem​<br>please answer within one hour
    14·2 answers
  • Someone plz help me :(.
    5·1 answer
  • Rationalize the denominator.<br> - 11x^3/<br> Root7x+1
    12·1 answer
  • What is the common denominator of StartFraction 1 Over a EndFraction StartFraction 1 Over b EndFraction in the complex fraction
    15·2 answers
  • Write 12/root2 + root18 in the form broot2 where b is an interger
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!