Answer:
a is the right answer
Step-by-step explanation:
it is A
Step-by-step explanation: cuz i got the big brain
Why is it so hard to solve problems in your head after middle school?
Answer:
Because your sleep deprived and your head is clumped up with more equations. :( i wish school was easy
Step-by-step explanation:
Answer:
It is complicated to answer but there are several factors which contribute toward the difficulty of learning how to solve problems. A person's motivation (anxiety) and poor understanding of the how and why of the material. But there are more internal factors as well, mental and metal learning handicaps. For example, Dyscalculia is a common condition where individuals have issues with making basic calculations and using those numbers the way their peers do. (Dyslexia, ADD/ADHAD, Dysgraphia, and Dyspraxia are other examples.
The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level. In an earlier study, the population proportion was estimated to be 0.21. How large a sample would be required in order to estimate the fraction of tenth graders reading at or below the eighth grade level at the 90% confidence level with an error of at most 0.03
Answer:
A sample of 499 is needed.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of [tex]\pi[/tex], and a confidence level of [tex]1-\alpha[/tex], we have the following confidence interval of proportions.
[tex]\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
In which
z is the zscore that has a pvalue of [tex]1 - \frac{\alpha}{2}[/tex].
The margin of error is given by:
[tex]M = z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
In this question, we have that:
[tex]\pi = 0.21[/tex]
90% confidence level
So [tex]\alpha = 0.1[/tex], z is the value of Z that has a pvalue of [tex]1 - \frac{0.1}{2} = 0.95[/tex], so [tex]Z = 1.645[/tex].
How large a sample would be required in order to estimate the fraction of tenth graders reading at or below the eighth grade level at the 90% confidence level with an error of at most 0.03
We need a sample of n, which is found when [tex]M = 0.03[/tex]. So
[tex]M = z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
[tex]0.03 = 1.645\sqrt{\frac{0.21*0.79}{n}}[/tex]
[tex]0.03\sqrt{n} = 1.645\sqrt{0.21*0.79}[/tex]
[tex]\sqrt{n} = \frac{1.645\sqrt{0.21*0.79}}{0.03}[/tex]
[tex](\sqrt{n})^2 = (\frac{1.645\sqrt{0.21*0.79}}{0.03})^2[/tex]
[tex]n = 498.81[/tex]
Rounding up
A sample of 499 is needed.
Which exponent value makes the statement true? 16=2? 8 6 4 3
what is the answer to -3.4 - 1.6?
Answer:
-5
Step-by-step explanation:
-3.4 - 1.6 = -5
The Distributive Property
Use the Distributive Property to evaluate each expression.
1. 3(2+8)
3. -5(4-2)
5. 8(10-4)
Answer:
1. 30
2. -10
3. 48
Step-by-step explanation:
So for #1 I did:
3*2(6)+3*8(24) which equals 30
For #2 I did:
-5*4(-20)- -5*2(-10) which equals -10
For #3 I did:
8*10(80)-8*4(32) which equals 48
Also brainliest
Also sub to pewdiepie
a certain componnt for newly developed electronic disel engine is considered to be defective if its diameter is less than 8.0 mm or greater than 10.5mm. the distribution of the diameters of these parts is known to be normal with mean of 9.0 mm and standard deviation of 1.5 mm.if a component is randomly selected what is probability that it will be defective?
Answer:
The probability is 0.58992 or simply 0.59
Step-by-step explanation:
We start by getting the z-scores of the diameter
we have this as follows;
Mathematically;
z-score = (x-mean)/SD
mean = 9.0 mm
SD = 1.5 mm
For 8.00 mm, we have
z = (8-9)/1.5 = -0.67
For 10.5 mm, we have
z = (10.5-9)/1.5 = 1
So the probability we want to calculate is;
P( 1 < x < -0.67)
we can calculate this using the standard normal distribution table
We have this as ;
P( x < -0.67) - P( x > 1) = 0.58992
Which equation represents the slope-intercept form of the line below?
15
y-intercept = (0, 2)
slope =-
O A. y=-x-2
O B. y = 2x+
O c. y=-x+2
D. y = 2x-
Answer:
c. y=-x+2
Step-by-step explanation:
since the slope is -1 and the y-intercept is 2, you can plug those numbers into the equation and get y=-x+2.
A radio station ordered hats and coffee mugs to give away as prizes. A total of 1,000 of these items were ordered, and 3 times as many coffee mugs were ordered as hats. In which equation does h represent the number of hats ordered?
Answer:
The options are not shown, so i will answer in a general way.
Let's define the variables:
h = number of hats
m = number of mugs.
We know that a total of 1000 items were ordered, then:
h + m = 1000
We also know that we have 3 times more mugs than hats, this can be written as:
m = 3*h
Now we have the system of equations:
h + m = 1000
m = 3*h
To solve these, we usually start by isolating one of the variables in one equation and then replace that in the other equation, but in this case, we already have m isolated in the second equation, then we can replace that in the first equation to get:
h + m = 1000
h + (3*h) = 1000
Now we can solve this equation for h, and find the number of hats ordered.
4*h = 1000
h = 1000/4 = 250
There were 250 hats ordered.
What is the slope of the line through (2,-2)(2,−2)
Answer: 0. the line is not determine because both points have the same coordinates.
Step-by-step explanation:
m = (y-y)/(x-x)
m = (- 2 - -2)/(2 - 2)
m = (- 2 + 2)/(2- 2)
m = 0
Find the solution of this system of equations. Separate the x- and y- with commas.
x = -6 + y
and
-7x + 9y = 8
Answer:
x = -23
y = -17
Step-by-step explanation:
[tex]x = - 6 + y \\ - 7x + 9y = 8 \\ \\ - 7( - 6 + y) + 9y = 8 \\ 42 - 7y + 9y = 8 \\ 2y = 8 - 42 \\ y = \frac{ - 34}{2} \\ y = - 17 \\ \\ x = - 6 + y \\ x = - 6 + ( - 17) \\ x = - 6 - 17 \\ x = - 23[/tex]
Answer:
Step-by-step explanation:
-7(-6 + y) + 9y = 8
42 - 7y + 9y = 8
2y + 42 = 8
2y = -34
y = -17
x = -6 - 17
x = -23
(-23, -17)
19 = -23+ 6(2 - p)
Can someone please help me?!?!
Step-by-step explanation:
19 = -23+ 6(2 - p)
19=-23+12-6p
19=-11-6p
6p=-11-19
6p=-30
p= -5
Answer:Solve for p
by simplifying both sides of the equation, then isolating the variable.
Step-by-step explanation: exact form: p= 2/3
decimal form p= 0.6
A local television station for a city with a population of 500,000 recently conducted a poll where they invited viewers to call in and voice their support or opposition to a controversial referendum that was to be voted on in an upcoming election. Over 10,000 people responded, with 67% opposed to the referendum. The TV station announced that they are convinced that the referendum will be defeated in the election.
Select the answer below that indicates whether the TV station's announcement is valid or invalid, and why.
a. Valid, because 67% is far enough above 50% to predict a majority vote.
b. Invalid, because the sample may not be representative of the population.
c. Valid, because the sample size is large enough to represent the population.
d. Invalid, because the sample is too small given the size of the population.
Answer:
b. Invalid, because the sample may not be representative of the population.
Step-by-step explanation:
A sample of around 10% of the population is needed to be representative.
In this question:
We have a population of 500,000, and a sample of 10,000.
10,000/500,000 = 1/50 = 0.02 = 2% of the population, so not representative, and option b is correct.
Need help ASAP
Write an algebraic expression to represent the verbal expressions
Answer:
4*x^2+5x
Explanation:
For some reason i feel like im a black belt fighter and a martial arts master
Answer:
Good for you!
Step-by-step explanation:
look its you and your friends!
Answer:
I used to do martial arts ʕ•ᴥ•ʔ
Step-by-step explanation:
There are 6 belt colors: white belt, orange belt, blue belt, yellow belt, green belt, brown belt, and black belt. All belts besides the white belt can have dashes to indicate further progress. Black is the most powerful, showing the power of FIGHT ! Here is a summary of the different karate belts.
Match the addition and subtraction problems to their solutions:
Answer:
1. B
2.c
3. E
4.d
5.A
Step-by-step explanation:
Answer:
we conclude that:
5/7 - 3/7: B 2/7
1/6+3/6: C 2/3
1/2+1/4: E 3/4
1/5+1/2: D 7/10
1/6-1/8: A 1/24
Step-by-step explanation:
1)
Given the expression
[tex]\frac{5}{7}-\frac{3}{7}[/tex]
Apply the fraction rule: [tex]\frac{a}{c}-\frac{b}{c}=\frac{a-b}{c}[/tex]
[tex]\frac{5}{7}-\frac{3}{7}=\frac{5-3}{7}[/tex]
Add the numbers: [tex]5-3=2[/tex]
[tex]=\frac{2}{7}[/tex]
2)
Given the expression
[tex]\frac{1}{6}+\frac{3}{6}[/tex]
Apply the fraction rule: [tex]\frac{a}{c}+\frac{b}{c}=\frac{a+b}{c}[/tex]
[tex]\frac{1}{6}+\frac{3}{6}=\frac{1+3}{6}[/tex]
Add the numbers: [tex]1+3=4[/tex]
[tex]=\frac{4}{6}[/tex]
Cancel 4/6: 2/3
[tex]=\frac{2}{3}[/tex]
3)
Given the expression
[tex]\frac{1}{2}+\frac{1}{4}[/tex]
Lease common multiplier of 2, 4: 4
Adjust fractions based on LCM
[tex]\frac{1}{2}+\frac{1}{4}=\frac{2}{4}+\frac{1}{4}[/tex]
Apply the fraction rule: [tex]\frac{a}{c}+\frac{b}{c}=\frac{a+b}{c}[/tex]
[tex]\frac{2}{4}+\frac{1}{4}=\frac{2+1}{4}[/tex]
Add the numbers: [tex]2+1=3[/tex]
[tex]=\frac{3}{4}[/tex]
4)
[tex]\frac{1}{5}+\frac{1}{2}[/tex]
Lease common multiplier of 5, 2: 10
Adjust fractions based on LCM
[tex]\frac{1}{5}+\frac{1}{2}=\frac{2}{10}+\frac{5}{10}[/tex]
Apply the fraction rule: [tex]\frac{a}{c}+\frac{b}{c}=\frac{a+b}{c}[/tex]
[tex]\frac{2}{10}+\frac{5}{10}=\frac{2+5}{10}[/tex]
Add the numbers: 2+5 = 7
[tex]=\frac{7}{10}[/tex]
5)
Given the expression
[tex]\frac{1}{6}-\frac{1}{8}[/tex]
Lease common multiplier of 6, 8: 24
Adjust fractions based on LCM
[tex]\frac{1}{6}-\frac{1}{8}=\frac{4}{24}-\frac{3}{24}[/tex]
Apply the fraction rule: [tex]\frac{a}{c}-\frac{b}{c}=\frac{a-b}{c}[/tex]
[tex]\frac{4}{24}-\frac{3}{24}=\frac{4-3}{24}[/tex]
[tex]=\frac{1}{24}[/tex]
Therefore, we conclude that:
5/7 - 3/7: B 2/7
1/6+3/6: C 2/3
1/2+1/4: E 3/4
1/5+1/2: D 7/10
1/6-1/8: A 1/24
Determine whether the following statements are always true, sometimes true, or never true.
The sum of two positive integers is positive.
A
The sum of two negative integers is negative.
B
The difference between two positive integers is positive.
C
The difference between two negative integers is negative.
D
A positive integer minus a negative integer is negative.
E
Answer:
a= true
b=never
c=true
d=never
e=true
What is the slope of the line 2y = 12x + -8?
Answer:
Slope is: y = 6x-4
Step-by-step explanation:
Divide both sides by 2 and you'll get the answer.
Answer:
6
Step-by-step explanation:
a slope equation. is y = mx + b
first you have to get y by itself by dividing both sides by 2
your new equation is
y= 6x + - 4 or just y = 6x - 4
the slope is the m value and in this case its 6
Auto spent 3/4 of the money he had saved on a new video game. If the video game cost $48, how much money did he have before he bought the game
Answer:
64
Step-by-step explanation:
The part of money he spent =3/4
Let the total money Otto has be 'x'.
Then according to the question, we have
3/4x = 48
Multiply 4 on both the sides, we get
3x = 48 X 4
Divide 3 on both the sides, we get
x = 48 X 4 / 3
x = 64!
BOOM!
What does 8/y + 6 have in common with 8^y + 5?
A. they have the same value
B. both are binomial
C. both are trinomials
D. neither is a polynomial
Answer:
Answer is d because no is a polynomial
70.544 +0.04 Round your answer
Answer:
71
Step-by-step explanation:
70.544 + 0.04 = 70.584
Round to te nearest integer:
71
Step-by-step explanation:
[tex]70.544 + 0.04 = 70.584 = 70.6[/tex]
Round to nearest integer is 71
Click and drag like terms onto each other to simplify fully.
-5+4+4x+x+4
The figures below are semicircles and squares. Find the perimeter and the area of each shape. Give your answer as a completely simplified exact value in terms of pi (no approximations). Please give both area and perimeter.
Step-by-step explanation:
Perimeter of a semicircle = 0.5πd.
Perimeter of big semicircle = (0.5)(π)(18cm) = 9πcm
Perimeter of 3 small semicircles = (1.5)(π)(6cm) = 9πcm
Hence total perimeter = 9πcm + 9πcm = 18πcm.
Area of a semicircle = 0.5πr²
Area of big semicircle = (0.5)(π)(9cm)² = 40.5πcm²
Area of 3 small semicircles = (1.5)(π)(3cm)² = 13.5πcm².
Hence total area = 40.5πcm² + 13.5πcm² = 54πcm².
Identify the zeros of the graph of the function g(x).
Answer:
-4 and -2
Step-by-step explanation:
The function has the factors (x + 4) and (x + 2). By setting these both to 0, you will find the zeros of the function.
x + 4 = 0
x = -4
x + 2 = 0
x = -2
Therefore, the zeros of the function are -4 and -2.
In which quadrant are the following points in
c< (78/10 - 6/10) ÷ 9/10
Answer:
c < 8
Step-by-step explanation:
Find the value of x if A, B, and C are collinear points and B is between A and C. AB=6x,BC=x−5,AC=23
Answer:
The value of x = 4 if A, B, and C are collinear points and B is between A and C.
Step-by-step explanation:
We need to find the value of x if A, B, and C are collinear points and B is between A and C.
We have AB=6x,BC=x−5,AC=23
If points are collinear and B is between A and C we can write:
AC=AB+BC
Putting values and finding value of x
[tex]AC = AB+BC\\23=6x+x-5\\23=7x-5\\7x=23+5\\7x=28\\x=\frac{28}{7}\\x=4[/tex]
The value of x = 4 if A, B, and C are collinear points and B is between A and C.
Bottles of sparkling water usually cost $1.69 each. This week they are on sale for 4 for $5. How much more did you pay THIS week
Answer:
You paid $3.31 more
Step-by-step explanation:
Taking $5 and subtracting it with 1.69 you get 3.31
Hope this helped have a great day
Answer:
The cost of 1 sparkling bottle in this week is less than last week, so we pay less this week. We pay $0.44 less this week. This week cost of 4 bottles is $5.
1490 thousand help me get that number because I can't find them
Answer:
1,490,000
Step-by-step explanation:
Answer:
1490000?
Step-by-step explanation:
2/3 parts of the earth 's surface is covered with water.
(i) Express it in percent.
(II) How many percent is the continental part ?
Answer:
Water =2/3× 100%=200/3%=66.67%
So land will be 100% - 66.67%
=33.33
Please and this one❤️
Answer:
○ [tex]\displaystyle ]-1, 2[\:only[/tex]
Step-by-step explanation:
When you look at the graph, you can tell that part of the graph starts from the coordinate [tex]\displaystyle [-1, 8],[/tex] decreasing and eventually TERMINATES at the coordinate [tex]\displaystyle [2, -4].[/tex] Hence, you have your answer.
I am joyous to assist you at any time.
**We base everything off of the x-coordinates because they are vertical-wise, which in this case is [tex]\displaystyle 2[/tex] and [tex]\displaystyle -1.[/tex]
