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Tutors Answer Your Questions about Matrices-and-determiminant (FREE)
Question 334121: Find the monthly house payment necessary to amortize the following loan.
In order to purchase a home, a family borrows $167,000 at 8.2% for 15 yr. What is their monthly payment? Round the answer to the nearest cent.
A)$1615.28 B)$1141.17 C)$11,751.63 D)$1865.85
please show work
Click here to see answer by rfer(16322)  |
Question 343462: A dietitian wants a patient to have meal with 66 grams of protein, 94.5 grams of carbohydrates, and 910 milligrams of calcium. The meal is composed of chicken, corn, milk. Each serving of chicken has 30 grams of protein, 35 grams of carbs, and 200 milligrams of calcium. Each serving of corn has 3 grams of protein, 16 grams of carbs, and 10 milligrams of calcium. Each serving of milk has 9 grams of protein, 13 grams of carbs, and 300 milligrams of calcium. How many servings of each need to be given to the patient?
I got the problems set up like this:
chicken=x
corn=y
milk=z
30x+3y+9z=66
35x+16y+13z=94.5
200x+10y+300z=910
I am pretty sure I need to do matrices , but don't know how to break it down? Can you please help me?
Click here to see answer by Fombitz(32388)  |
Question 345680: Need help with systems of equations using matrices.
Don't know how to set up this problem.
A change machine contains nickels, dimes, and quarters. There are 75 coins in the machine and the value of the coins is $7.25. If there are 5 times as many nickels as dimes, find the number of coins of each type in the machine.
Need by 9pm tonight (if possible). Thank you for your time.
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 346098: I need to find the intersecting points of two equations: y=.15x and y=.2(x-20)and graph them. I have included my problem and what is expected. I'm lost.
Ok this is what I got :
You would set the two equations equal to each other and solve for x
.15x=.2(x-20) using the Elimination Method
Reorder the terms:
0.15x = 0.2(-20 + x)
0.15x = (-20 * 0.2 + x * 0.2)
0.15x = (-4 + 0.2x)
Solving
0.15x = -4 + 0.2x
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-0.2x' to each side of the equation.
0.15x + -0.2x = -4 + 0.2x + -0.2x
Combine like terms: 0.15x + -0.2x = -0.05x
-0.05x = -4 + 0.2x + -0.2x
Combine like terms: 0.2x + -0.2x = 0.0
-0.05x = -4 + 0.0
-0.05x = -4
Divide each side by '-0.05'.
x = 80
Simplifying
x = 80
Now that X = 80, I plugged it into the equation y=0.15x and got this:
y=0.15x
y=0.15(80)
y= 12
Now this is the question to my problem and I do not know how to get the answer. I have to graph this and show the intersection.
a teacher is looking for the best option in purchasing school supplies for a classroom. Where Company A is offering a discount for every dollar amount spent on school supplies and where Company B is offering a higher discount than Company A, but the discount for Company B is only offered for every dollar amount spent above $20.00. I will determine and explain which company will offer a better price based upon the dollar amount the teacher spends on school supplies.
Option 1- Company A will offer her a 15% discount on the total amount spent in the store.
Option 2- Company B will offer her a 20% discount on the remaining amount after the first $20 is spent.
Depict the situation graphically, using appropriate graphing software such as Excel or an online graphing utility.
Include the following in your graph:
• A depiction of each cost option on the same graph
• Clear labels of the cost to the hypothetical customer for both options on the graph
• The intersection of the cost options (if one exists)
I'm so lost. I do not know how to graph this. Please help if you can.
Click here to see answer by Fombitz(32388) |
Question 346098: I need to find the intersecting points of two equations: y=.15x and y=.2(x-20)and graph them. I have included my problem and what is expected. I'm lost.
Ok this is what I got :
You would set the two equations equal to each other and solve for x
.15x=.2(x-20) using the Elimination Method
Reorder the terms:
0.15x = 0.2(-20 + x)
0.15x = (-20 * 0.2 + x * 0.2)
0.15x = (-4 + 0.2x)
Solving
0.15x = -4 + 0.2x
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-0.2x' to each side of the equation.
0.15x + -0.2x = -4 + 0.2x + -0.2x
Combine like terms: 0.15x + -0.2x = -0.05x
-0.05x = -4 + 0.2x + -0.2x
Combine like terms: 0.2x + -0.2x = 0.0
-0.05x = -4 + 0.0
-0.05x = -4
Divide each side by '-0.05'.
x = 80
Simplifying
x = 80
Now that X = 80, I plugged it into the equation y=0.15x and got this:
y=0.15x
y=0.15(80)
y= 12
Now this is the question to my problem and I do not know how to get the answer. I have to graph this and show the intersection.
a teacher is looking for the best option in purchasing school supplies for a classroom. Where Company A is offering a discount for every dollar amount spent on school supplies and where Company B is offering a higher discount than Company A, but the discount for Company B is only offered for every dollar amount spent above $20.00. I will determine and explain which company will offer a better price based upon the dollar amount the teacher spends on school supplies.
Option 1- Company A will offer her a 15% discount on the total amount spent in the store.
Option 2- Company B will offer her a 20% discount on the remaining amount after the first $20 is spent.
Depict the situation graphically, using appropriate graphing software such as Excel or an online graphing utility.
Include the following in your graph:
• A depiction of each cost option on the same graph
• Clear labels of the cost to the hypothetical customer for both options on the graph
• The intersection of the cost options (if one exists)
I'm so lost. I do not know how to graph this. Please help if you can.
Click here to see answer by mananth(16946)  |
Question 346215: How do I find the inverse of [5 3]
[7 9]? (That's supposed to be a matrix, I didn't know how to make one on here)
So far I have gotten the determinant of 21 but I don't remember what to do from there.
Thanks
Click here to see answer by Fombitz(32388) |
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