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Tutors Answer Your Questions about Matrices-and-determiminant (FREE)
Question 151324: I am lost with this assignment, HELP! I do not understand hwo these are answered!
4. A group of students decides to sell pizzas to help raise money for their senior class trip. They sold pepperoni for $12, sausage for $10, and cheese for $8. At the end of their sales the class sold a total of 600 pizzas and made $5900. The students sold 175 more cheese pizzas than sausage pizzas. Set up a system of three equations and three unknowns, use an augmented matrix to solve, and show all work to receive full credit.
A. What are the three unknowns?
B. Write a separate equation representing each of the first three sentences.
C. Determine the augmented matrix that represents the three equations.
D. Solve for the matrix. Show all work to receive full credit.
E. How many of each type of pizza were sold?
Click here to see answer by stanbon(26270)   |
Question 151324: I am lost with this assignment, HELP! I do not understand hwo these are answered!
4. A group of students decides to sell pizzas to help raise money for their senior class trip. They sold pepperoni for $12, sausage for $10, and cheese for $8. At the end of their sales the class sold a total of 600 pizzas and made $5900. The students sold 175 more cheese pizzas than sausage pizzas. Set up a system of three equations and three unknowns, use an augmented matrix to solve, and show all work to receive full credit.
A. What are the three unknowns?
B. Write a separate equation representing each of the first three sentences.
C. Determine the augmented matrix that represents the three equations.
D. Solve for the matrix. Show all work to receive full credit.
E. How many of each type of pizza were sold?
Click here to see answer by jim_thompson5910(13787) |
Question 151666: I am trying to find the dual problem for the following question...
Maximize z= 8X1 + 3X2 + X3
Subject to : 7X1 + 6X2 + 8X3 (less than or equal to) 18
4X1 + 5X2 + 10X3 (less than or equal to) 20
with X1 (great than or equal to) 0 , X2 (greater than or equal to) 0 , X3 (greater than or equal to) 0
Click here to see answer by kev82(145) |
Question 151878: Could someone please help me with this word problem? I can't get past the point of the inverse matrix.
A local sorority sold hotdogs and bratwursts at the spring fling picnic. The first day they sold 8 dozen hotdogs and 13 dozen bratwursts for 339.60. The second day they sold 10 dozen hotdogs and 15 dozen bratwursts for a total of 402.00. How much did each cost?
Each hotdog sold for $?
Each bratwurst sold for $?
Click here to see answer by checkley77(7049) |
Question 153215: Create a "2 by 3" matrices
Directions
1. add them together 2. subtract them 3. multiply them by the scalar 4. I set up the problem below, but having trouble solving it. please help me. due tomorrow!!!!!!!!!
4 {3,4,5,2,11,6}
Click here to see answer by Fombitz(2113)  |
Question 155403: A dietician is planning a meal of beef, rice and carrots. The meal must contain 96.3g of carbs, 50.0g of protein, and 22.8g of fat. Using the nutrition information below, use the Gaussian elimination method to determine how many grams of beef, rice, and carrots, the meal must contain in order to meet the dietician's requirements.
CARBS PROTEIN FAT
beef 1 22 12
rice 25 2 0
carrots 8 1 0
I wrote the following equations:
1b + 25r + 8c = 96.3
22b + 2r + 1c = 50
12b = 22.8
I then used b=1.9, but got the wrong answer.
Click here to see answer by Edwin McCravy(2922) |
Question 155949: I am completely lost on how to solve augmented matrices.
If you could show me step by step how to solve the
following equation it would be great.
3x + 4y = 11
x + 3y = 2
I know you have to break it down like this
[ 3 4 11]
[ 1 3 2]
After this however I am lost.
Click here to see answer by Edwin McCravy(2922) |
Question 156059: If A is a 3 × 4 matrix, B is a 3 × 4 matrix, and C is a 3 × 4 matrix, then A + B - C =
a. a 9 × 12 matrix
b. a 3 × 4 matrix
c. a 27 × 64 matrix
d. impossible, you cannot add or subtract matrices
Click here to see answer by orca(409) |
Question 156060: Let A and B be 2 × 2 matrices. Let [ 2 3 ] and [ -4 5 ] be the first and second rows of A, respectively. Let [ 2 3 ] and [ -4 5 ] be the first and second columns of B, respectively. If C = AB, then | C | =
a. 484
b. 452
c. 582
d. -724
Click here to see answer by Fombitz(2113) |
Question 156057: Let A and B be 2 × 2 matrices. Let [ 2 3 ] and [ -4 5 ] be the first and second rows of A, respectively. Let [ 2 3 ] and [ -4 5 ] be the first and second columns of B, respectively. If C = AB, then the element c(sub 22) =
a. 41
b. 7
c. 11
d..21
Click here to see answer by oscargut(682)  |
Question 156048: Let H and E be 2 × 2 matrices. Let [ 4 3 ] and [ 2 0 ] be the first and second rows of A, respectively; [ 3 6 ] and [ 2 3 ] be the first and second rows of B, respectively. If D = H + E, then the d 11 element of D -1 is =
a. 2/9
b. 0
c. It does not exist
d. You cannot find the inverse of a matrix
Click here to see answer by Fombitz(2113) |
Question 156056: You have been performing Gaussian Elimination, and now you have all of the lower
triangle elements with value 0. What are you ready to do? I think the answer is c, but I want to make sure
a. Nothing, you are done with Gaussian Elimination
b. Start with forwards elimination
c. Start backwards elimination
d. Start over; you are supposed to have all zeroes in the upper triangle
Click here to see answer by jim_thompson5910(13787) |
Question 156589: . A total of 700 tickets were sold for a musical. Senior citizen tickets sold for $15, children tickets sold for $20, and adult tickets sold for $25; the total earnings from ticket sales was $15,750. Five times more children tickets were sold than senior citizen tickets. How many tickets of each type were sold? Set up a system of three equations and three unknowns, use an augmented matrix to solve
I have most of the matrix figured out Here is what I got
[ 1 1 1 700 ]
[ 4 5 3 3,140 ] divided by 5
[ 0 5
I am struggling with the bottom half of the matrix. Specifically what numbers do I put in the last two columns. I am also struggling solving the matrix. Thanks for any help.
Click here to see answer by scott8148(3382)  |
Question 156805: Please help me solve this problem: A boat goes downstream a distance of 5 miles in 15 minutes, but it takes 20 minutes for the return trip. Find the right of the boat in still water and the rate of the current.
Click here to see answer by nerdybill(2446)  |
Question 156820: I still can't get how to answer this question:
If a girl works for 8 minutes and her brother works for 15 minutes, they can wash the front windows of their house. Also, if the girl works for 12 minutes and her brother works for 10 minutes, they can wash the same windows. How long will it take each person alone to wash windows? (Hint: if it takes t minutes for a person to do a job alone, then in 1 minute, the person can do 1/t of the job.)
Click here to see answer by ankor@dixie-net.com(6693)  |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900
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