Please help! Vectors and angles
A ship is sailing through the water in the English Channel with a velocity of 22 knots along a bearing of 157° (knots being a unit used to measure the speed of aircrafts and boats). The current has a velocity of 5 knots along a bearing of 213°. Find the resultant velocity and direction of the ship. (Remember that bearing is measured clockwise from the north axis).
1) 25 knots at 166.5 degree
2) 27 knots at 350 degree
3) 166.5 knots at 25 degree
4) 350 knots at 27 degree
Find the margin of error for each sample. Then find an interval likely to contain the true population proportion.
a. 15% of 457 teachers
b. 56% of 87 musicians
Full answers please
Two angles whose measures add up to 90º are called?
Use the x-intercept method to find all real solutions of the equation. x^3-9x^2+11x+21=0
Answer:
c: x=-1,3,7
Step-by-step explanation:
An automobile manufacturer sold 30,000 new cars, one to each of 30,000 customers, in a certain year. The manufacturer was interested in investigating the proportion of the new cars that experienced a mechanical problem within the first 5,000 miles driven. (a)
A list of the names and addresses of all customers who bought the new cars is available. Describe a sampling plan that could be used to obtain a simple random sample of 1,000 customers from the list.
Each customer from a simple random sample of 1,000 customers who bought one of the new cars was asked whether they experienced any mechanical problems within the first 5,000 miles driven. Forty customers from the sample reported a problem. Of the 40 customers who reported a problem, 13 customers, or 32.5%, reported a problem specifically with the power door locks. (b)
Explain why 0.325 should not be used to estimate the population proportion of the 30,000 new cars sold that experienced a problem with the power door locks within the first 5,000 miles driven. (c)
Based on the results of the sample, give a point estimate of the number of new cars sold that experienced a problem with the power door locks within the first 5,000 miles driven.
Analyzing the situation of the automobile industry it will be important that:
A)build a list that attracts buyers to cars, looking for an interested audience, through emails, nearby residents.
B) 0.013
C)390
If it is necessary to analyze how to attract a corresponding public so that a car sale can take place, a list will be created that takes into account:
A) 1) Define the sample population: The costumers who bought a new car on a certain year.
2) Define the size of population: Of the 30000 customers who bought a car, you want to contact 1000 customers.
3) Define the contact options: You have a list of names and addresses, therefore you can send a questionnaire via mail.
4) Form a sampling frame: You will send the questionnaires and you will wait two months for the answer.
5) Define the analysis method: In your case, you want a quantitative research and therefore a probabilistic sampling.
B) The 32.5% probability refers to customers having issues with the power doors locks among the costumers who had problems, it does not consider the customers who did not have any problem or those who had problems after the first 5000 miles.
C) In order to find the probability of a power door lock problem if there have been problems within the first 5000 miles, we need to consider the whole sample:
[tex]P= \frac{13}{1000} = 0.013[/tex]
[tex]N=0.013*30000=390[/tex]
Hence, the number of new cars sold that experienced a problem with the power door locks within the first 5000 miles will be 390.
A rectangular room has an area of 315 square feet. the length is 6 feet more than the width. find the dimensions of the room.
The room's width is calculated to be 15 feet, and the length, which is 6 feet more than the width, comes to 21 feet. These dimensions satisfy the given area of 315 square feet for the rectangular room.
To find the dimensions of a rectangular room with a known area where one dimension is dependent on the other, we can use algebraic methods to determine the length and width. In this case, the area of the room is given as 315 square feet and it is known that the length is 6 feet more than the width. Let's denote the width of the room as 'w' feet. Therefore, the length will be 'w + 6' feet. The area of a rectangle is calculated by multiplying the length by the width, so we have the following equation:
w imes (w + 6) = 315
Expanding the left side of the equation gives us:
w²+ 6w = 315
To find the value of w, let's move all terms to one side to form a quadratic equation:
w²+6w - 315 = 0
Now we can solve this quadratic equation either by factoring, completing the square, or using the quadratic formula. For this case, factoring is applicable. We look for two numbers that multiply to -315 and add up to 6. The numbers 21 and -15 satisfy this condition. Therefore, we can write the equation as:
(w + 21)(w - 15) = 0
The possible solutions for w are -21 or 15; since a width cannot be negative, we take the positive solution:
w = 15 feet
Having obtained the width, we can now find the length:
Length = w + 6 = 15 feet + 6 feet = 21 feet
Therefore, the dimensions of the room are 15 feet in width and 21 feet in length.
m 2 = 40°, m 4 = 150°, m 3 =
The answer is 110° Hope this helps!
The steepness, or grade, of a highway or railroad is expressed as a percent. In the photo of the cog railway at Pike’s Peak, in Colorado, the grade is 18%. Thus, for every 100 ft of horizontal run, the train rises 18 ft. Find the angle of the inclination of the railway.
Why are jobs at food stands and restaurants good for college students?
Answer:
The reason a university student is looking for work is that he needs an extra salary income.
Step-by-step explanation:
It is a way to get a salary without overloading tasks.
In addition to that many times, they are given the time to study and work because there are very flexible schedules.
The university student gets used to the need to work for a fixed salary.
In addition, many university students need income to be able to pay the value of the semester or any project necessary for the university.
The ratio of the areas of two similar polygons is 400:25. what is the ratio of their corresponding sides
Answer: 16:1
simplify 400:25 by dividing 400 by 25, which is 16.
Barbara is making bracelets to sell on her Etsy site. It costs her $0.79 per bead and she needs 22 beads per bracelet. She sells her bracelets for $28 each. What is the percent markup per bracelet?
To convert a distance of 1.25 miles to feet, which ratio could you multiply by? Remember that 1 mile = 5280 feet.
please help with this vertical asymptote of rational functions problem
A. x= -5
B. x=0
C. x= -2
D. x= 5
The ratio of gold charms to silver charms is 1:3. Which statement does not describe the relationship?
Answer: A
Step-by-step explanation:
Graph f(x)=- square root -x
The graph of function f (x) = - √- x is shown in image.
We have to given that,
Graph the function,
f (x) = - √- x
Here, Function is defined as,
f (x) = - √- x
At x = 0;
f (x) = - √-0
f (x) = 0
Plot the graph of function f (x) = - √- x.
Hence, The graph of function f (x) = - √- x is shown in image.
Learn more about the function visit:
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If using the method of completing the square to solve the quadratic equation x^2+13x-35=0x 2 +13x−35=0, which number would have to be added to "complete the square"?
Answer:
42.25 or 169/4 on delta math
Step-by-step explanation:
Simplify the expression.
(–1 + 6i) + (–4 + 2i)
In the coordinate plane line p had slope 8 and y intercept (0,5). Line r is the result of dilating line p by a factor of 3 with (0,3) what is the slope and y intercept of line r?
The slope of line r is 24 and the y-intercept is (0, 3).
How to find the slope and y-intercept?
To find the slope and y-intercept of line r, which is the result of dilating line p by a factor of 3 with a center at (0,3), we can use the following steps:
The slope of the dilated line r is the product of the dilation factor and the slope of the original line p.
The y-intercept of the dilated line r is the point where the original line p intersects the line of dilation.
Given that line p has a slope of 8 and a y-intercept of (0,5), the slope of line r is:
8 * 3 = 24.
The y-intercept is (0, 3)
Therefore, the slope of line r is 24 and the y-intercept is (0, 3).
The table below shows the number of hours some college athletes in two states spend on indoor sports each week:
State A 7 9 5 4 25 21 6 6 8
State B 14 12 10 13 15 14 11 15 16
Part A: Create a five-number summary and calculate the interquartile range for the two sets of data. (6 points)
Part B: Are the box plots symmetric? Justify your answer. (4 points)
The negative sign can be read as "the opposite of." true or false
Answer:
true
Step-by-step explanation:
in a cylinder the radius and height was quadrupled. How much bigger would the new surface area be then the original surface area.
The coordinate grid shows the plot of four equations. A coordinate plane is shown with four lines graphed. Line A crosses the x axis at negative 3.2 and has a slope of 4. Line B crosses the x axis at 3 and the y axis at 6. Line C crosses the x axis at 1.5 and the y axis at negative 6. Line D crosses the x axis at negative 3 and the y axis at 3. Which set of equations has (2, 2) as its solution? A and D B and D A and C B and C
A and B share the cost in a ratio of 3:2. A pays £125 how much does b pay?
To solve this problem, we can set up proportion, which is two equivalent ratios. In this case, we are using the ratio of A to B to figure out the amount that B pays using our value for A. We are allowing x to represent the unknown value for the B payment. This is modeled below:
3/2 = £125/x
To simplify, we can perform cross-multiplication. This means multiplying the numerator of one fraction by the denominator of the other and setting it equal to the product of the other numerator and denominator. This is modeled below:
(125)(2) = (3)(x)
Next, we can simplify the equation by performing the multiplication on both sides of the equation.
250 = 3x
Finally, we should divide both sides by 3 to get our unknown variable x alone on the right side of the equation.
x = 83.33
Therefore, B costs £83.33.
Hope this helps!
saidhari bought a toaster oven for $60. this price was 1/4 off the list price. What was the list price
Final answer:
The list price of the toaster oven was $80.
Explanation:
To find the list price, we need to determine the price of the toaster oven before the discount. Let's call the list price 'x'. The discount is 1/4 off the list price, so the discounted price is 3/4 of the list price. We can set up the equation 3/4 * x = $60 to find the value of 'x'. To solve for x, we can multiply both sides of the equation by 4/3: (3/4 * 4/3) * x = $60 * 4/3. Simplifying the equation gives us x = $80.
The sum in a half adder can be represented by what boolean expression (assuming a
Suppose that a jar contains 4 pens: 2 black, 1 blue, and 1 red. three people select a pen at random from the jar, sign a document, and replace the pen in the jar before the next person selects a pen. what is the probability that none of the people use the red pen to sign the document?
The scores on a final exam were approximately normally distributed with a mean of 82 and a standard deviation of 11. If 85 students took the exam, and above a 60 is a passing grade, how many students failed the exam?
A. 2
B. 12
C. 13
D. 1
A system of equations is shown below:
x + y = 3
2x – y = 6
The x-coordinate of the solution to this system of equations is _____.
If (x + 1)(x - 3) = 12, then which of the following statements is true?
Keisha is investing her money in an IRA. Initially she will be putting in $775. Using C as the additional amount invested each month, translate this problem into an algebraic expression that will show how much Keisha invested for the entire year.