N N Which of the following is an equation of line k in the xy-plane above? (A) y=-x-4 (B) y = x+2 (C) 2y - 3x = -8 (D) 2y - 3x = -4
Answers
Answer:
[tex]2y-3x=-8[/tex]Explanation:
Given the graph in the attached image;
The intercept of the line on the y-axis is at;
[tex]\begin{gathered} y=-4 \\ At\text{ point;} \\ (0,-4) \\ \text{ intercept b is;} \\ b=-4 \end{gathered}[/tex]At the x=2, the value of y is;
[tex]\begin{gathered} y=-1 \\ at\text{ point;} \\ (2,-1) \\ \end{gathered}[/tex]The slope of the line can be calculated using the two points on the graph;
[tex]\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1} \\ m=\frac{-1-(-4)}{2-0}=\frac{-1+4}{2} \\ m=\frac{3}{2} \end{gathered}[/tex]The slope intercept equation of a straight line is of the form;
[tex]y=mx+b[/tex]substituting the slope m and intercept b we have;
[tex]y=\frac{3}{2}x-4[/tex]As this is not among the given options, let us solve further;
multiply through by 2 and move the x term to the left side;
[tex]\begin{gathered} y(2)=\frac{3}{2}x(2)-4(2) \\ 2y=3x-8 \\ 2y-3x=-8 \end{gathered}[/tex]Therefore, from the given options the correct equation for the line is C;
[tex]2y-3x=-8[/tex]Related Questions
Which property is shown here?10 + (4 + 7b) = (10 + 4) + 7bDistributive PropertyAssociative Property of AdditionAssociative Property of MultiplicationCommutative Property of AdditionCommutative Property of Multiplication> Next Question
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the property shown is the Cummulative Property of Addition
10 + (4 + 7b) = 14 + 7b
(10 +
Solve the system of equations using a table and graph. X-2y=3. Y+3x=-5
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[tex]x = 3 + 2y.....(3)equation[/tex]
[tex]y + 3(3 + 2y) = - 5 \\ y + 9 + 6y = - 5 \\ y + 6y = - 5 - 9 \\ 7y = - 14 \\ \frac{7y}{7} = \frac{ - 14}{7} \\ y = - 2[/tex]
[tex]x = 3 + 2y \\ x = 3 + 2( - 2) \\ x = 3 - 4 \\ x = - 1[/tex]
ATTACHED IS THE SOLUTION.
Pre calculus 28.An object is traveling around a circle with a radius of 3 feet. It is completing 1 full revolutionevery 5 seconds. What is the linear speed (in ft/sec) and the angular speed (in rad/sec)?
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We need to find the linear and the angular speeds of an object traveling around a circle.
The radius r of the circle is 3 feet. Thus, the perimeter p of the circle is:
[tex]\begin{gathered} p=2\pi r \\ \\ p=2\pi(3\text{ ft}) \\ \\ p=6\pi\text{ ft} \end{gathered}[/tex]Also, we know that the object completes one full revolution every 5 seconds.
Thus, to find the linear speed V, we need to divide the number of feet it travels by the number of seconds it takes:
[tex]\begin{gathered} V=\frac{p}{5\text{ sec}} \\ \\ V=\frac{6\pi\text{ ft}}{5\text{ sec}} \\ \\ V=1.2\pi\text{ ft/sec} \end{gathered}[/tex]ow, tnotice that the complete revolution has 2π radians.
Then, to find the angular speed ω, we need to divide the number of radians it travels by the number of seconds it takes:
[tex]\begin{gathered} \omega=\frac{2\pi\text{ rad}}{5\text{ sec}} \\ \\ \omega=0.4\pi\text{ rad/sec} \end{gathered}[/tex]Therefore:
[tex]\begin{gathered} \text{ linear speed: }1.2\pi\text{ ft/sec} \\ \\ \text{ angulat speed: }0.4\pi\text{ rad/sec} \end{gathered}[/tex]Last year the volleyball team paid $5 per pair for socks and $17 per pair for shorts on a total purchase of $315. This year they spent $342 to buy the same number of pairs of socks and shorts because the socks now cost $6 a pair and the shorts cost $18.
a. Write a system of two equations that represents the number of pairs of socks and shorts bought each year.
b. How many pairs of socks and shorts did the team buy each year?
Answers
a. The system of equations to be solved is
5so + 17sh= 315
6so + 18sh= 342
b. The amount of pairs of socks and shorts bougth are 12 and 15 respectively.
System of linear equationsA system of linear equations is a set of two or more equations of the first degree, in which two or more unknowns are related.
Systems of linear equations have as a solution set all ordered pairs (x, y) that satisfy the equation, where x and y are real numbers.
This caseIn this case, a system of linear equations must be proposed taking into account that:
"so" is the pairs of socks bougth ."sh" is the amount of shorts bougth.You know that:
Last year the volleyball team paid $5 per pair for socks and $17 per pair for shorts on a total purchase of $315. This year they spent $342 to buy the same number of pairs of socks and shorts because the socks now cost $6 a pair and the shorts cost $18.So, the system of equations to be solved is
5so + 17sh= 315
6so + 18sh= 342
There are several methods to solve a system of equations, it is decided to solve it using the substitution method, which consists of clearing one of the unknowns in one of the equations and substituting the expression in the other equation.
In this case, isolating the variable "so" in the first equation, you obtain:
5so= 315 - 17sh
so= (315 - 17sh)÷5
so= 315÷5 - 17÷5sh
so= 63 - 17/5sh
Replacing this expression in the second equation you get:
6×(63 - 17/5sh) + 18sh= 342
Solving:
6×63 - 6×17/5sh + 18sh= 342
378 - 102/4sh + 18sh= 342
- 102/4sh + 18sh= 342 - 378
-12/5sh= -36
sh= (-36)÷ (-12/5)
sh= 15
Remembering that so= 63 - 17/5sh, you get
so= 63 - 17/5×15
so= 12
Finally, the amount of pairs of socks and shorts bougth are 12 and 15 respectively.
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16. Find the measure of 2 ABC in circle D.a. 100A100b. 50C. 140d. 25
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we have that
m by inscribed angle
so
mm
What is A-B.If A is 32 and B is 30
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To solve the exercise, we subtract the given numbers:
[tex]\begin{gathered} A=32 \\ B=30 \end{gathered}[/tex][tex]A-B=32-30=2[/tex]At the local corner store, you can buy a 3-ounce bag of Nacho Cheese Doritos for $0.78 At Costco, you can get a larger 15-ounce bag of Nacho Cheese Doritos $3.75 Which is the better buy?
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A 15 ounce bag = $3.75
15 divided by 3 = 5
0.78 x 5 = 3.9
3.9 is greater than 3.75
So technically the 15 ounce bag is the better buy
Two buses leave a station at the same time and travel in opposite directions. One bus travels 9 km/h slower than the other. If the two buses are 514 kilometers apart after 2 hours, what is the rate of each bus?
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A line passes though two points A(-2, 2). B(-1, 2). What is the slope:
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Answer:
The slope is 0
Step-by-step explanation:
Slope = (y2 - y1) / (x2 - x1)
Where the values of x and y are from the known points
Here the points are (-2,2) and (-1,2)
So we have (x1,y1) = (-2,2) and (x2,y2) = (-1,2)
This means, x1 = -2 , x2 = -1 , y1 = 2 and y2 = 2
We now plug these values into the slope formula
Recall slope = (y2 - y1) / (x2 - x1)
==> plug in x1 = -2 , x2 = -2 , y1 = 2, y2 = 2
Slope = (2 - 2) / (-1 - (-2)
==> remove parenthesis
Slope = (2-2) / (-1 + 2)
==> simplify addition and subtraction
Slope = 0 / 1 = 0
x-5/2=yI need the answers on a table
Answers
Given the equation:
[tex]y=x-\frac{5}{2}[/tex]Since the required table is not given, we will solve for values of x from -3 to 3.
[tex]\begin{gathered} \text{When }x=-3,y=-3-\frac{5}{2}=-5.5 \\ \text{When }x=-2,y=-2-\frac{5}{2}=-4.5 \\ \text{When }x=-1,y=-1-\frac{5}{2}=-3.5 \\ \text{When }x=0,y=0-\frac{5}{2}=-2.5 \\ \text{When }x=1,y=1-\frac{5}{2}=-1.5 \\ \text{When }x=2,y=2-\frac{5}{2}=-0.5 \\ \text{When }x=3,y=3-\frac{5}{2}=0.5 \end{gathered}[/tex]You can then place this in a table of x and y values.
You can use the same process to complete any table.
Please help! Using the bar chart, what percent of the world population lives in Asia?
Answers
Answer:
58.25%
Step-by-step explanation:
add all the numbers
3340/all the numbers=your final answer
Add all the numbers
What is the equation for the following graph?option 1: y=1/2x+2option 2: y= -1/2x+2option 3: y=2x+2option 4: y= -2x+2
Answers
The Solution.
The equation of the given graph is an equation of a line, which is given as the formula below:
[tex]\begin{gathered} y-y_1=m(x-x_1) \\ \text{Where m = slope} \end{gathered}[/tex]First, we shall pick any 2 coordinates in the given line graph:
(-4,0) and (0,2)
[tex]\begin{gathered} (-4,0)\rightarrow(x_1=-4,y_1=0) \\ (0,2)\rightarrow(x_2=0,\text{ }y_2=2) \end{gathered}[/tex]The slope ( m) is given as below:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]Substituting the appropriate values given above, we get
[tex]m=\frac{2-0}{0--4}=\frac{2}{4}=\frac{1}{2}[/tex]So, the equation of the graph is :
[tex]\begin{gathered} y-0=\frac{1}{2}(x--4) \\ \\ y=\frac{1}{2}(x+4) \\ or \\ 2y=x+4 \end{gathered}[/tex]In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 41 and a standard deviation of 7. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 27 and 55?
Answers
The distribution of the number of phone calls with a mean of 41 and a standard deviation of 7. 95.44% is the percentage of the daily phone calls between 27 and 55.
Given that,
The distribution of the number of phone calls handled by each of the 12 receptionists in a mid-sized company is bell-shaped, with a mean of 41 and a standard deviation of 7. When applying the empirical rule.
We have to find what percentage of daily phone calls, on average, fall between the range of 27 and 55.
Mean=41
Standard deviation=7
x=27 and 55
Let, x₁=27 and x₂=55
First calculate z-score for the daily sample of 27 calls.
Formula z-score=(x-mean)/standard deviation.
z-score=(27-41)/7
z-score=-14/7
z-score=-2
So, z-score for the daily sample of 27 calls is -2.
Now, calculate z-score for the daily sample of 55 calls.
z-score=(55-41)/7
z-score=14/7
z-score=2
So, z-score for the daily sample of 55 calls is 2.
We can see that there is a change in z-score of 27 and 55 that is -2 and 2.
By using normal distribution table
The percentage of the daily phone calls between 27 and 55 =
0.9772-0.0228=0.9544
Therefore, 95.44% is the percentage of the daily phone calls between 27 and 55.
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Suppose that $21,800 is invested in a certificate of deposit for 3 years at 9.6% annual interest to be compounded semi-annually. How much interest will this investment earn? Round your answer to the nearest cent, if necessary.
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The total compound interest is $7,081.8 , which interest will this investment earn.
What is compound interest?
Compound interest is interest that builds up over a set length of time on both principal and interest. The principal is also used to account for the interest that has accrued on a principal over time.Interest on the principal plus compounded interest is known as compound interest.Initial balance= 21,800$
Interest rate =9.6%
Term=3yrs0mos
Compounding frequency=semi-annually (2/Yr)
CI= P(1+(r/n)^nt-P
The final balance is $28,881.8.
The total compound interest is $7,081.8.
The total compound interest is $7,081.8 , which interest will this investment earn.
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what is the value of x in this triangle?A. 70B. 63C. 93D. None of the above
Answers
The sum of the angles in a triangle is 180 degrees. It means that
110 + 5x + 2x = 180
110 + 7x = 180
7x = 180 - 110
7x = 70
x = 70/7
x = 10
The value of x in the triangle is 10
Therefore, the correct option is
D. None of the above
Ngoc needs to mix a 10% alcohol solution with a 60% alcohol solution to create 200 milliliters of a 22.5% solution. How many milliliters of each solution must Ngoc use?
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Ngoc needs to mix a 10% alcohol solution with a 60% alcohol solution to create 200 milliliters of a 22.5% solution. How many milliliters of each solution must Ngoc use?
Let
x -----> milliliters of solution at 10%
y -----> milliliters of solution at 60%
we have
x+y=200 ------> equation A
Remember that
10%=0.10
60%=0.60
22.5%=0.225
so
0.10x+0.60y=0.225(200) -----> equation B
solve the system of equation s A and B
Solve by graphing
using a graphing tool
see the attached figure
please wait a minute to draw the system
the solution is the point (150,50)
therefore
milliliters of solution at 10% is 150milliliters of solution at 60% is 506. What is the range of the relation y = 2x+ + 3x if the domain is the set (-2,-1,0}? 1) {2,1,0} 2) {2,-1,0) 3) {-1,-5,0 4) {10,1,0}
Answers
For the given relation
[tex]y=2x^2+3x[/tex]With domain {-2, -1, 0}.
The domain represents all possible values of x, also called input, of the relationship and the range represents all the values of y, also called output, obtained when you replece the formula with the given values of x.
To determine the range of the valiable you have to do as follows:
For x=-2
[tex]y=2(-2)^2+3(-2)=2[/tex]For x=-1
[tex]y=2(-1)^2+3(-1)=-1[/tex]For x=0
[tex]y=2(0)^2+3\cdot0=0[/tex]For the relation with domain {-2,-1,0} the range is {2, -1, 0}
The correct option is number 2)
Write a coordinate proof: Given: Coordinates of triangle DEF, H is the midpoint of DA, G is the midpoint of EA . Prove: Side DG is congruent to side EH Here is the image down below. I have to fill in the blanks with each of the correct choices that are provided down below.
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SOLUTION
Consider the image in the below
From the diagram above,
[tex]\begin{gathered} H\text{ is the mid point of AD} \\ \text{And } \\ G\text{ is the midpoint of AE} \end{gathered}[/tex]Then we obtain the coordinate of H and G
Using the coordinate of midpoint formula,
[tex]\begin{gathered} \text{Coordinate of H is } \\ (-\frac{2h+0}{2},\frac{2k+0}{2})=(\frac{-2h}{2},\frac{2k}{2})=(-h,k) \end{gathered}[/tex]Then
[tex]\begin{gathered} \text{Coordinate of G } \\ (\frac{2h+0}{2},\frac{2k+0}{2})=(\frac{2h}{2},\frac{2k}{2})=(h,k) \end{gathered}[/tex]Then use the distance formula to fined the lenght of |EH| and |DG|
The Distance formula is given by
[tex]\text{Distance}=\sqrt[]{(y_2-y_1)^2+(x_2-x_1)^2}[/tex]Hence
[tex]\begin{gathered} U\sin g\text{ the coordinatesH= (-h,k) and E= (2h,0) } \\ \text{Then} \\ |EH|=\sqrt[]{(2h-(-h)^2+(0-k)^2} \\ |EH|=\sqrt[]{(3h)^2+(-k)^2} \\ \text{Then } \\ |EH|=\sqrt[]{9h^2+k^2} \end{gathered}[/tex]Then
[tex]\begin{gathered} \text{ Using the coordinatesG= (h,k) and D=(-2h,0) for |DG|} \\ |DG|\text{ =}\sqrt[]{(-2h-h)^2+(0-k)^2} \\ |DG|=\sqrt[]{(-3h)^2^{}+(-k)^2} \\ \text{hence } \\ |DG|-=\sqrt[]{9h^2+k^2} \end{gathered}[/tex]
Hence
Since we obtain the same expression above
Then
[tex]\begin{gathered} |EH|=|DG| \\ or \\ |DG|=|EH| \end{gathered}[/tex]therefore
[tex]|DG|\cong|EH|[/tex]Therefore
Answer: DG is congruent to side EH
Each of the 6 students reported the number of movies the saw in the past year.11, 17, 11,8, 15, 9find the Median & Mean number of movies that each student saw round to the nearest tenth
Answers
Solution
The median is the middle number in a sorted, ascending or descending, list of numbers
We need to arrange them in ascending order
8, 9, 11, 11, 15, 17
The middle numbers are 11 and 11
Median = (11 + 11)/2 = 11.
Mean is the sum (total) of all the values in a set of data, such as numbers or measurements, divided by the number of values on the list.
[tex]\text{ Mean}=\frac{8+9+11+11+15+17}{6}\approx11.8[/tex]Median is 11
The mean is 11.8
Type the correct answer in the box. The area is ___ (BLANK) square units.
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The figure is a trapezoid, and the area of a trapezoid can be calculated with the formula below:
[tex]A=\frac{(B+b)h}{2}[/tex]Where B is the greater base, b is the smaller base and h is the height.
To find the measure of the smaller base, we need to find the missing piece to the right of the value "3 units" (let's call it x).
To calculate it, we can use the total length of the greater base:
[tex]\begin{gathered} 9+x+3=21\\ \\ 12+x=21\\ \\ x=21-12\\ \\ x=9 \end{gathered}[/tex]Therefore the smaller base is 3 + 9 = 12 units.
Now, calculating the trapezoid area, we have:
[tex]A=\frac{(21+12)5}{2}=\frac{33\cdot5}{2}=82.5\text{ u^^b2}[/tex]if 32 is added to the data set which statement is true
Answers
We have a dataset: 13, 6, 13, 8, 2, 19, 11, 16, 17, with size n = 9.
We will add 32 to it.
In this case, the mean will be affected, as it depends on each individual value of the dataset. As the number is greater than all the numbers in the dataset, it will be greater than the actual mean. Then, the mean will increase.
The median may or may not change, depending on the values of the set.
Then, we can find the median before and after the addition.
First, we have to sort the data: 2, 6, 8, 11, 13, 13, 16, 17, 19.
The median, for a size n =9, will be located in the fifth place, so the median is 13.
Then, the dataset has 4 values below and 4 values above the median.
When we add 32, it will be the greatest value, so we will have a dataset of size n =10 and sorted as: 2, 6, 8, 11, 13, 13, 16, 17, 19, 32.
The median will be the average between the fifth and sixth place. Both values are 13, so the average, and therefore, the median will be also 13.
Then, in this case, the mean increases but the median does not.
Answer: The mean will increase and the median will remain the same.
If point M is located at (-8, 3), which ordered pair below represents a 180-degree rotation about the originof point M?
Answers
A 180-degree rotation about the origin transforms point (x, y) into (-x,-y). then:
M(-8, 3) → M'(8, -3)
Linus what to buy ribbon to make three bookmarks. One bookmark will be 14,5 inches long and the other two will be 9,25 inches long. How much ribbon should he buy in centimeters ( assume 1 inche=0,0254 meters)
Answers
Given:
ribbon's long as 14.5 inches one and 9.25 inches two ribbons.
Total ribbon needed = 14.5+2(9.25)
[tex]\text{Total ribbon needed}=14.5+18.5[/tex][tex]\text{Total ribbon needed}=33\text{ inches}[/tex][tex]\text{Total ribbon needed}=33\times0.0254\times100\text{ cm}[/tex][tex]\text{Total ribbon needed}=83.82\text{ cm}[/tex]Therefore, He should but 83.82 cm long ribbon.
Hi, can you help me answer this question please, thank you
Answers
We have the following information from the question:
[tex]\begin{gathered} sample\text{ size, n=18} \\ \text{standard deviation=0.4} \\ \text{sample mean, }\bar{\text{x}}=\frac{sum\text{ of data values}}{\text{number of data values}} \\ \bar{x}=\frac{3149.94}{18} \\ \bar{x}\cong175 \end{gathered}[/tex]a) To get the critical value, we would find the significance level first.
Thus, we have:
[tex]\begin{gathered} \text{Significance level, }\alpha=1-confidence\text{ interval} \\ C.I=80\text{\%=0.8} \\ \alpha=1-0.8 \\ \alpha=0.2 \end{gathered}[/tex][tex]\begin{gathered} \text{Critical value=Z}_{\frac{\alpha}{2}}=Z_{\frac{0.2}{2}}=Z_{0.1}=1.28\text{ ( from the z-table)} \\ \text{Therefore, critical value=}\pm\text{1.28}0 \end{gathered}[/tex][tex]\begin{gathered} S\tan dard\text{ deviation of the sample mean, }\sigma_{\bar{x}}=\frac{\sigma}{\sqrt[]{n}} \\ \sigma_{\bar{x}}=\frac{0.4}{\sqrt[]{18}}=0.0943 \end{gathered}[/tex]b) To find the confidence interval, we have to obtain the Margin of Error first.
[tex]\text{Margin of Error,E}=\text{critical value}\times\text{standard deviation of the sample mean(standard error)}[/tex][tex]\begin{gathered} E=1.28\times0.0943 \\ E=0.1207 \end{gathered}[/tex]Therefore, the Confidence Interval is:
[tex]\bar{x}-E<\mu<\bar{x}+E[/tex][tex]\begin{gathered} 175-0.1207<\mu<175+0.1207 \\ 174.88<\mu<175.12 \end{gathered}[/tex]A tela telephone company offers two different types of billing the First Choice was to pay $10 per month plus $0.09 per MB of data the second choice is to pay $16 per month plus $0.07 per MB of data part a writing system of equations to model the situation the total cost for 1 month with each company Part B how many MB of data would you have to use in one month in order for both plans to cost the same amount explain how you determine your answer
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find the missing value of the probability distribution
I inserted the link to the question. please help asap
Answers
The missing value of the probability distribution is 0.05.
What is the probability?Probability is defined as the possibility of an event being equal to the ratio of the number of favorable outcomes and the total number of outcomes.
X : 0 1 2 3 4
P(X) : 0.30 0.25 0.25 0.15 ?
A discrete probability distribution function has two characteristics:
Each probability is between zero and one, inclusive. The sum of the probabilities is one.P(X = 4) = 1 - (0.30 + 0.25 + 0.25 + 0.15)
Apply the addition operation,
P(X = 4) = 1 - 0.95
Apply the subtraction operation to get
P(X = 4) = 0.05
Therefore, the missing value of the probability distribution is 0.05.
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Jacki works at the mattress store and collects 4.9% commission on every mattress she sells. She had a big sales day today and ended up selling a total of $8948.96 worth of mattresses. How much commission will she make today?
Answers
Answer:438.499
Step-by-step explanation:4.9% of 8948.96(also calcuator)
What is the surface area of this design? 5 in. 5 in. 560 in2 8 in. 490 in2 600 in 2 in. 440 in2 10 in. in
Answers
To find the surface area of the desing you need to find the are for all of the faces of the figure.
at the bottom we have a rectangular prism of sides 10, 10 and 2
sind the top, bottom and sides os this prism
[tex]\begin{gathered} \text{top and bottom} \\ 2\cdot10in\cdot10in=200in^2 \\ \text{sides } \\ 4\cdot10in\cdot2in^2=80in^2 \end{gathered}[/tex]total surface area at the bottom prism
[tex]200+80=280in^2[/tex]for the prism at the top we just add the area from the sides because the top was already considered at the top of the previous prism
[tex]\begin{gathered} \text{sides} \\ 4\cdot8in\cdot5in=160in^2 \end{gathered}[/tex]total surface are of the design is
[tex]280+160=440in^2[/tex][tex]8 \sqrt{5} + 2 \sqrt{45} [/tex]combine these radicals
Answers
Answer
Option C is correct.
8√5 + 2√45 = 14√5
Explanation
We need to simplify
8√5 + 2√45
Note that 45 = 9 × 5
8√5 + 2√45
= 8√5 + 2√(9 × 5)
= 8√5 + 2[√9 × √5]
√9 = 3
8√5 + 2[3 × √5]
= 8√5 + 2(3√5)
= 8√5 + 6√5
= 14√5
Hope this Helps!!!
Answer to this question
Answers
Step-by-step explanation:
