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Tutors Answer Your Questions about Expressions-with-variables (FREE)
Question 106765: I have been working on an assignment that involves solving using Cramer's rule I have set up the matrices but cannot get any further.
2x- y+ z =0 D= 2 -1 1 Dx 0 -1 +1
4x+6y-2z =0 4 +6 -2 0 +6 -2
x-2y- z =-9 1 -2 -1 -9 -2 -1
Dy 2 0 1 Dz 2 -1 0
4 0 -2 4 6 0
1 -9 -1 1 -2 -9
What the heck do I do now?
Click here to see answer by stanbon(26259)   |
Question 106763: Hello I have a substitution problem with 3 equations, there are no examples in my text for a 3 equation using the substitution method to solve when there are missing variables in some of them
3x + z=9
x + 3y =5
2x - y +2z=9
I have tried everything possible but I just cannot come up with a solution. Can you please help me out?
Click here to see answer by Earlsdon(4898) |
Question 107026: The attendance at a baseball game is 400. Student tickets cost $2 and adult tickets cost $3. The total sales is $1050. How many tickets of each type were sold.
The answer is 150 student ticktes and 250 adult tickets. I got this trough trial and error but cannot figure out the equation.
QUestion from Prentise Hall Algebra I - chapter 2.3
Click here to see answer by scott8148(3382)  |
Question 107177: I am trying to help my daughter with this question as well:
Malcom has a choice of profit sharing plans at work. He can receive 1/90 of the company's gross income or he can receive 1/60 of the company's net profit. Gross income is the total amount the company takes in. Profit is the income that is left after the expenses have been subtracted off. The company's expenses for one month are $100,000. What must the the gross income be for the two options to be equal? How much is each option worth at this point?
Click here to see answer by checkley75(3666) |
Question 107177: I am trying to help my daughter with this question as well:
Malcom has a choice of profit sharing plans at work. He can receive 1/90 of the company's gross income or he can receive 1/60 of the company's net profit. Gross income is the total amount the company takes in. Profit is the income that is left after the expenses have been subtracted off. The company's expenses for one month are $100,000. What must the the gross income be for the two options to be equal? How much is each option worth at this point?
Click here to see answer by stanbon(26259) |
Question 107174: Can you help me formulate an equation for the following homework problem? It did not come from a book. Thanks
Two friends live 15 miles apart. One day, they decide to jog and meet each other. Tanya leaves her house and heads east, jogging at a rate of 2.5 mph. At the same time Kelly leaves her house and heads west, jogging at 3.5 mph. How long does it take for the two to meet?
15= 2.5x for Tanya and
15= 3.5 x for Kelly? This can't be right, as I can only have one x. Please help
Click here to see answer by checkley75(3666) |
Question 107174: Can you help me formulate an equation for the following homework problem? It did not come from a book. Thanks
Two friends live 15 miles apart. One day, they decide to jog and meet each other. Tanya leaves her house and heads east, jogging at a rate of 2.5 mph. At the same time Kelly leaves her house and heads west, jogging at 3.5 mph. How long does it take for the two to meet?
15= 2.5x for Tanya and
15= 3.5 x for Kelly? This can't be right, as I can only have one x. Please help
Click here to see answer by stanbon(26259) |
Question 107217: i have worked this problem several times and I havent been able to come close to solving it.
8x^2=30x+8 the ^2 means to the 2nd power. I wasn't sure how to enter exponents. Can anyone help me?
Thank you,
Click here to see answer by bucky(1732) |
Question 107261: I submitted an easier problem and I see maybe if I submitted this one instead it would help me solve the easier one. Help!! I need to add or subtract as indicated and express the results in simplest form.
(-12)/(x^2+ x- 12) + (x^2)/(x+ 4)(x - 3) + (x)/
(x^2 + x 12)
Click here to see answer by Annabelle1(69) |
Question 107122: Your company offers gourmet coffee beans for $14 per pound and regular coffee beans for $6 per pound. If I put 12 pounds of the gourmet coffee beans in the mixer, how much of the regular coffee beans do I add to get a mixture that costs $8 per pound?
Click here to see answer by bucky(1732) |
Question 107297: this is a word problem that has to be broke into mathematical terms and solved: officer reid wrote up 9 more tickets than officer smith did. together they wrote up 35 tickets. how many tickets did officer reid write? i know the answer from the back of my book i just dont understand how they got that answer.
Click here to see answer by Earlsdon(4898) |
Question 107526: Define a variable, set up an equation and solve each problem.
1. An angle measures 17 degrees more than its complement. Find the measure of the angle.
2. An angle measures 5 degrees more than three times its supplement. Find the measure of the angle.
Click here to see answer by solver91311(5072)  |
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