Answers
Answer:
m = 12, the error was that the student did not divide both sides by -. so they got the incorrect answer
Step-by-step explanation:
okay, so you want to get m
because m is divided by 3, to counter it, you multiply both sides by three
-m/3 = -4
-m/3 times 3 =-4 times 3
because 1/3 times 3 =1, and -4 times 3 = -12, you get
-m = -12
then, divide both sides by - (because you want positive m)
and you get m = 12
the error was that the student did not divide by the negative, so in the end, their sign was wrong.
Related Questions
Researchers have noted a decline in cognitive functioning as people age (Bartus, 1990). However, the results from other research suggest that the antioxidants in foods such as blueberries can reduce and even reverse these age-related declines, at least in laboratory rats (Joseph et al., 1999). Based on these results, one might theorize that the same antioxidants might also benefit elderly humans. Suppose a researcher is interested in testing this theory. The researcher obtains a sample of adults who are older than 65, and gives each participant a daily dose of a blueberry supplement that is very high in antioxidants. After taking the supplement for 6 months, the participants are given a standardized cognitive skills test and produce a mean score of . For the general population of elderly adults, scores on the test average μ and form a normal distribution with σ=9.
(a)-Can the researcher conclude that the supplement has a significant effect on cognitive skill? Use a two-tailed
Answers
Complete Question
The complete question is shown on the first uploaded image
Answer:
a
Yes the researcher can conclude that the supplement has a significant effect on cognitive skill
b
[tex]d = 0.5778 [/tex]
c
The result of this hypothesis test shows that there is sufficient evidence to that the supplement had significant effect.The measure of effect size is large due to the large value of Cohen's d (0.5778 > 0.30 )
Step-by-step explanation:
From the question we are told that
The sample size is n=16
The sample mean is [tex]M = 50.2[/tex]
The standard deviation is [tex]\sigma = 9[/tex]
The population mean is [tex]\mu = 45[/tex]
The level of significance is [tex]\alpha = 0.05[/tex]
The null hypothesis is [tex]H_o \mu =45[/tex]
The alternative hypothesis is [tex]H_a \mu \ne 45[/tex]
Generally the test statistics is mathematically represented as
[tex]z = \frac{M - \mu}{\frac{\sigma}{\sqrt{n} } }[/tex]
=> [tex]z = \frac{50.2 - 45}{\frac{9}{\sqrt{16} } }[/tex]
=> [tex]z = 2.31 [/tex]
Generally the p-value is mathematically represented as
[tex]p-value = 2 * P(Z > z )[/tex]
[tex]p-value = 2 * P(Z > 2.31 )[/tex]
From the z-table
[tex]P(Z > 2.31 ) = 0.010444[/tex]
=> [tex]p-value = 2 * 0.010444 [/tex]
=> [tex]p-value = 0.021 [/tex]
From the obtained values we see that [tex]p-value < 0.05[/tex]
Decision Rule
Reject the null hypothesis
Conclusion
There is sufficient evidence to conclude that the supplement has a significant effect on the cognitive skill of elderly adults
Generally the Cohen's d for this study is mathematically represented as
[tex]d = \frac{M - \mu}{\sigma }[/tex]
=> [tex]d = \frac{50.2 -45}{9 }[/tex]
=> [tex]d = 0.5778 [/tex]
Laila reads 36 pages in 4 hours which expression can be used to find the number of pages she reads per hour
A.
[tex] \frac{36hours}{4pages} [/tex]
B.
[tex] \frac{4pages}{36hours} [/tex]
C.
[tex] \frac{4hours}{36pages} [/tex]
D.
[tex] \frac{36pages}{4hours} [/tex]
Answers
Answer:
D
Step-by-step explanation:
36 pages divided by 4
Help please! The problem is in the photo.
Answers
Answer:
f(-3) = 7
Step-by-step explanation:
For these types of questions, you need to replace the x's in the equation with whatever is inside f(x)
So if its f(5) you would sub 5 into where all the x's are
Hi can somebody help me with this equation, please? 50=2(x+3)+10
Answers
Answer: x = 17
Step-by-step explanation:
1) Subtract 10 from both sides
40 = 2(x+3)
2) Divide both sides by 2.
20 = x + 3
3) Subtract 3 from both sides
17 = x
x = 17
Answer: x= 17
Step-by-step explanation:
17 plus 3= 20
then you multiply 20 times 2 (PEMDAS)
Then you get 40 and 40 + 10
equals 50
Which linear equation has a slope of 3 and a y-intercept of -2?
y = 3x + 2
y=3x-2
y=-2x + 3
y = -2x - 3
Answers
Answer:
y=3x-2
Step-by-step explanation:
3 is the coefficient of x (slope)
-2 comes after (y-int)
linear equation y = 3x-2 has a slope of 3 and a y-intercept of -2.
What is the Slope of a line?A line's slope can be determined by looking at its slope. The slope is determined mathematically as "increase over run" (change in y divided by change in x). There are several ways to find the slope, including standard form, slope-intercept form, and point-intercept form.
Given, A linear equation that has a slope of 3 and a y-intercept of -2.
Y-intercept of -2 means at x = 0 y would be -2
The slope-intercept form of a line is
y = mx + c
where m = slope
c = constant
Substituting the values in the given equation
-2 = 0 * 3 + c
c = -2
thus, the equation of the line,
y = 3x -2
therefore, The y-intercept of the linear equation y = 3x-2 is -2, and its slope is 3.
Learn more bout slope here:
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Math is hard please help, and explain i need to learn this.
Answers
Answer:
c
Step-by-step explanation:
Answer:
C is the answer
Step-by-step explanation:
What is the distance between -3 and 12?
Answers
Answer:
-15
Step-by-step explanation:
The required solution is 15.
It is required to find the solution.
What is arithmetic?Arithmetic is the branch of mathematics that deals with the study of numbers using various operations on them. Basic operations of math are addition, subtraction, multiplication and division. These operations are denoted by the given symbols.
Given:
By the distance formula we get,
Distance between -3 and 12 is
=12-(-3)
=15
Therefore, the required solution is 15.
Learn more details about arithmetic here:
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Using the following graph, determine the slope of the line,
The slope of the line is
Answers
Answer:
-2
Step-by-step explanation:
Just choose any two points and calculate the slope. The way to calculate the slope between two points (x1, y1) and (x2, y2) is (y2-y1)/(x2-x1)
Camden paid $11.48 for sliced cheese at the deli counter. The cheese cost $3.28 per pound. How much cheese did Camden buy? *
Answers
Answer:
he bought 3.5 pounds because 3.28 times 3.5 equals the cost
Step-by-step explanation:
what is the percent of 74 is 37
Answers
Answer:
50% take 37/74 ×100 to get the answer
The correct answer is 50.trust me it is
Please show your work? Thank you 10 points.
Answers
Answer:
13
Step-by-step explanation:
12^2+5^2=x^2
144+25=x^2
169=x^2
Take the square root of 169 and get 13
Caroline walks 912 inches per second. As unit rate
Answers
Answer:
specify please
Step-by-step explanation:
Answer:
I have been trying to get this answer for the longest
Step-by-step explanation:
If gallon of paint covers of a wall, then how much paint is needed to cover the entire wall?
Answers
Answer:
4 gallons will be needed to paint an entire room
If -2x -4 = -4x + 3, then does x = 3
Answers
Answer:
No it doesn't.
Step-by-step explanation:
lin makes sparkling orange juice by mixing 3 liters of orange juice with 4 liters of soda water. Noah makes sparkling orange juice by mixing 4 liters of orange juice with 5 liters of soda water. How do the two mixtures compare in taste explain your reasoning
Answers
Answer:
Step-by-step explanation:
Lin makes sparkling OJ using the ratio
3:4. Meaning 3L orange juice for every 4L sparkling water.
Noah makes sparkling OJ using the ratio 4:5. Meaning 4L orange juice for 5L sparkling water.
If we said that they both used 12L of orange juice,
Lin would have to use 16L of sparkling water
Noah would have to use 15L of sparkling water
So for the same 12L of orange juice, Lin uses more sparkling water.
Therefore her sparkling OJ would be more diluted (less orange flavour since you added more water) and more bubbly than Noah's.
Four more than one-third x
Answers
Answer:
four more than 1/3 would be 1 and 2/3
Step-by-step explanation:
9514 1404 393
Answer:
(1/3)x +4
Step-by-step explanation:
One-third x is ...
(1/3)x
Four more than that is ...
(1/3)x +4
_____
Additional ways this can be written
1/3x +4
4 +1/3x
x/3 +4
4 +x/3
What is the product of 3/4 and6/ 7?
O -7/8
O -9/14
O 9/14
O 7/8
Answers
Answer:
Third choice. 9/14
Step-by-step explanation:
3/4 x 6/7 = 18/28 = 9/14
Which of these ordered pairs is a solution of 3x−y=12? Choose all that apply.
Answers
Answer:
(0,-12)
Step-by-step explanation:
so you can get a app to graph it or graph it your self but that is the answer
lev buys a drink of $3.05 and a slice of a pizza for $5.40 he now has $12.37 let how much money did teddy have to begin with
Answers
Answer:
12.37 + 5.40 + 3.05 = $20.82
10) You and your friends order a meal for $116.29. How much
tip should you leave if you want to leave a 12% tip?
11) Originally priced at $19.59, a video game was found on a
62% off rack. What is the sale price of the video game?
12) A CD is marked with a sale sticker saying it is 56% off. The
original price is $10.17. What is the sale price?
Answers
The figure shows a right triangle next to a square.
What is the total area of the shape they make?
Answers
Answer:
Step-by-step explanation:
By using the Formula:
Areatriangle=10*5/2=25
Areasquare=5*5=25
Total Area is: 25+25=50
It will be nice if you give me brainliest.Good luck!
Answer:
50cm²
Step-by-step explanation:
Square- length x breadth
=5cmx 5cm
=25cm²
Triangle- ¹/₂ x base x perpendicular height
= ¹/₂x 5cm x 10cm
=25cm²
Square- 25cm²
Triangle-+25cm²
total area- 50 cm²
I hope it helps
Thank U
Drag these numbers from least to greatest. 0.7, - 4.5, 0.3, - 0.5, 2.3
Answers
Answer:
-4.5, -0.5, 0.3, 0.7, 2.3
Step-by-step explanation:
use a number line:
Walter is making a 300-mile trip from Wichita Falls, Texas to Austin, Texas. After the first 120 miles, he continues driving at 65 mph.
If the equation 120+65x=300 is used to describe this situation, what does the " x " represent?
Answers
Answer:
distance left
Step-by-step explanation:
Can someone explain to me adding and subtracting mixed numbers
Answers
Answer:
1.Find the Least Common Denominator (LCD)
2.Find the equivalent fractions.
3.Add or subtract the fractions and add or subtract the whole numbers.
4.Write your answer in the lowest terms.
Step-by-step explanation:
Step-by-step explanation:
So first, you turn the mixed numbers into improper fractions. Then you change the denominators to the same number. Finally, you add or subtract.
Example:
4 1/5- 2 1/2= 21/5- 5/2=42/10-25/10=17/10=1 7/10
what is the answer a b or c
Answers
Answer:
A
Step-by-step explanation:
I think
Answer:
66 tens
Step-by-step explanation:
66 hundreds is 6600, and if you divide it by 10, you get 660, or 66 tens.
-5n+4n-7=8
What is the answer for n and how do you solve it
Answers
Answer:
-15
Step-by-step explanation:
First combine like terms, aka the variables
-5n+4n-7=8
-1n-7=8
Then, isolate the variable by adding 7 to both sides
-1n-7+7=8+7
-1n=15
Finally, solve by dividing both sides by -1
-1n/-1=15/-1
n=-15
Answer:
n = -15
Step-by-step explanation:
I'll try my best to explain how I solved this
Equation:
-5n + 4n -7=8
Add the light terms on each side:
-n -7 =8
Separate the variables from the numbers:
-n = 15
Do the operation necessary to solve it:
n = -15
The coordinates for the vertices are A(1,3), B(4,0) ,C(1,-3) ,D(-2,0) what is the length of the AB
Answers
Answer: 3sqrt(2)
Step-by-step explanation:
d = sqrt[(3-0)^2 + (4-1)^2]
d = sqrt[9+9]
d = sqrt(18) = 3sqrt(2)
Find the y intercept
x-3y = 12
Help plz
Answers
Answer:
15
Step-by-step explanation:
Because 15 -3 will give you 12
Answer:
the y intercept is -4 or (0,4)
Step-by-step explanation:
To find the y intercept you have to make x zero, and vice versa. So:
0-3y = 12
-3y = 12
y = 12/-3
y = -4
the y intercept is -4 or (0,4)
Is x−1 a factor of 3x3−5x2−2?
Answers
Answer:
Yes
Step-by-step explanation:
According to google the anser is yes.
can you tell me how you get your answer
Answers
Answer:
The answer to this is: You click answer and then you just answer what the person asks and can i have brainliest?? please
Step-by-step explanation:
Answer:
For math I use my calculater :)
step-by-step explanation: