Tutors Answer Your Questions about Linear Algebra (FREE)
Question 83972: Hi! I have a question on how to work this problem. I know what the answer would be if they said what temperature would it be after 3 hours, but I do not even know what a linear relationship is.
The problem: Write a linear relationship that describes the out side temperature, T, as a function of the number of hours since 8:00am., h. At 8:00am the outside temperature was 76(degrees)F and each hour the temperature rose 3 degrees.
Thanks for your help,
Melissa
Click here to see answer by Nate(3500)  |
Question 84243: a. Find the equation of the straight line joinging the points (1,2) and (-3,5).
b. Find the equation of the straight line passing through the point (1,2) and perpendicular to the above straight line.
c. What is the point of intersection fo the two lines?
d. Algebraically verify your answer to above part of the problem.
Click here to see answer by jim_thompson5910(35256) |
Question 84697: Please help me solve this equauation.
Solve each problems
19. The current in a simple electrical circuit is inversely proportional to the resistance.If the current is 80 amp when the resistance is 30 ohms, find the current when the resistance is 12 ohms.
20. Write the equation that expresses the variation used in problem 19.
Thank you very much!
Click here to see answer by uma(370) |
Question 84765: An artist is painting a supply of small paintings to sell at an arts festival. He can paint three landscapes per hour and two seascapes. He can frame five paintings an hour. He has 50 hours available for painting and 25 hours for framing. How many of each type of painting should he paint and frame in order to maximize the total value of the paintings. He receives $25 each for the landscapes and $30 each for the seascapes.
A. Maximum value = $4,375 for 75 landscapes and 50 seascapes
B. Maximum value = $3,375 for 75 landscapes and 50 seascapes
C. Maximum value = $4,375 for 50 landscapes and 75 seascapes
D. Maximum value = $3,375 for 50 landscapes and 75 seascapes
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 84975: A linear programming feasible region is determined by
6x + 3y (is less or equal to) 72
5x + 15y (is less or equal to) 185
x^3 0, y (is greater or even to) 0
Which of the follwoing objective functions has its maximum value at the intersection of
6x + 3y = 72 and
5x + 15y = 185
A. Z = 10x + 10y
B. Z = 5x + 2y
C. Z = 2x + 8y
D. Z = 21x + 7y
Click here to see answer by Edwin McCravy(20055)  |
Question 85025: A small plane’s maximum takeoff weight for passengers, luggage, and cargo is 2000 pounds. Six passengers weight an average of 160 pounds each. Use an inequality to find the maximum weight of luggage and cargo the plan can carry.
Click here to see answer by stanbon(75887) |
Question 85298: Can anyone please solve this problem for me
1) Translate to an algebra statement; do not solve
Twice the difference of seven times a number and four yields the same result as the same number increased by six.
Click here to see answer by Lacey020991(49) |
Question 85262: Which point is not a corner of the feasible region of the system of inequalities
x + 2y (is less or equal to) 10
3x + y (is less or equal to) 10
x (is more or equal to) 0, y (is more or equal to) 0
A. (10/3, 0)
B. (2,4)
C. (0,5)
D. (10,0)
Click here to see answer by scianci(186) |
Question 85559: Two cars leave Dallas; one is traveling south on I-45 at 65 mph. The other travels north at 70 mph. They are talking to each other on walkie talkies. They can only talk to each other if they are within 20 miles of each other. How long will it be before the cars are 20 miles apart?
Click here to see answer by bucky(2189) |
Question 85560: Suppose that $18,000 is invested in two types of bonds for one year. part of the money is invested in a high-risk, high-growth fund that earned 24% annual interest. The rest is invested in a safe fund that earned 5% annual interest. If $2320 in interest is earned, how much was invested in each account?
Click here to see answer by stanbon(75887) |
Question 85632: The directions say "Is the relationship shown by the data linear? If it is, model the data with an equation."
The problem looks like this:
X Y
2 3
3 7
4 11
5 15
I have no idea what to do and no book to look to for help.
Thanks.
Click here to see answer by Earlsdon(6294) |
Question 85746: i am confuse how to find the pairs of equation is in dependent or independent and incosistent the ff lines will intersect or coincide this given equation
2x-5y+3=0
4x-10y-5=0 i hope you can help me this problem..thank you so much..
Click here to see answer by scianci(186) |
Question 86576: ok how do I write an equation or inequality to show the profit a business makes in selling purses at 250 dollars for 80 purses and 45 purses at 400 dollar will I be able to graph the business potential sales. and what are the reasons why we would use a function notation
Click here to see answer by stanbon(75887) |
Question 86861: f(x) = xsquared - x - 2 if f = 0,-2,1 I think i have to put the o and -2 and 1 where the x is and then do the equation but when I have a -2 and i subsitute it where their is a minus x then do I add the 2
Click here to see answer by Nate(3500) |
Question 86860: ok my problem is you have $30 in change in your drawer consisting of dimes and quarters write an inequality that shows the different number of coins in your drawer. so i think if I use x as the number of dimes and y as the quarters can I write that f(y) > f(x)
Click here to see answer by scott8148(6628)  |
Question 87172: Select the point which is in the feasible region of the system of inequalities
4x + y (is less or equal to) 8
2x + 5y (is less or equal to) 18
x (is greater or equal to)0, y (is greater or equal to) 0
A. (2,4)
B. (-1,2)
C. (1,3)
D. (4,1)
Click here to see answer by stanbon(75887) |
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