Tutors Answer Your Questions about Linear Algebra (FREE)
Question 171063: I'm trying to work this problem and I think that it actually will be a linear equation, but I'm having problems trying to set it up to make it come out right.
An auto service center has ten fifty-five gallon drums of 90% ethylene glycol, a common antifreeze fluid used in car radiators. The service center also has eight fifty-five gallon drums of 40% ethylene glycol solution as well. The manager wants to mix appropriate amounts of these two solutions to make 100 gallons of a 55% ethylene glycol concentration. How many gallons of the 90% solution will she need?
Can you help me with this one? I'm studying to take my final exam this coming Friday and I believe there will be questions of this type on my final.
Thank you
Click here to see answer by Earlsdon(6287)  |
Question 172858: Please help me. Even though this problem is old. i sometimes get stuck!
you want to buy a digital camera, which costs $250. Right now you have $115 and work for $9 an hour. How many hours do you have to work to be able to buy a digital camera?
Click here to see answer by colliefan(239) |
Question 172867: write an equation.then solve...sorry i messed up the first time...
you want to buy a digital camera, which costs $250. Right now you have $115 and work for $9 an hour. How many hours do you have to work to be able to buy a digital camera?
Click here to see answer by colliefan(239) |
Question 173475: A food store makes a 9-lb mixture of peanuts. cashews, and raisens. Peanuts cost $1.50 per pound, cashews cost $2.00 per pound, and raisens cost $1.00 per pound. The mixture calls for twice as much peanuts than cashews. The total cost of the mixture is $13.00. How much of each ingredient did the store use?
How do you det this up into equations?
Click here to see answer by Mathtut(3670) |
Question 173475: A food store makes a 9-lb mixture of peanuts. cashews, and raisens. Peanuts cost $1.50 per pound, cashews cost $2.00 per pound, and raisens cost $1.00 per pound. The mixture calls for twice as much peanuts than cashews. The total cost of the mixture is $13.00. How much of each ingredient did the store use?
How do you det this up into equations?
Click here to see answer by josmiceli(9681)  |
Question 173721: ok i wont dump all of my homework on you i just really need help
6x-24+4x= -2x +6
2x-24= -2x+ 6
4x-24=6
-24 -24
4x over 4 and 30 over 4
gah, this doesnt divide evenly.
please help, me with this
and finding the check.
Click here to see answer by elima(1433) |
Question 173822: PROBLEM:
Kevin and Ansu were in charge of the box office for the school play last night. Theyknow that they sold a total of 198 tickets, and that they made a total of $878.00. They also know that adult tickets sold for $5.00 each, and that student tickets sold for $3.00 each. The problem is, they can’t remember how many of each type of ticket they sold.Use the information provided to determine how many adult tickets and how manystudent tickets they sold.
Click here to see answer by gonzo(654) |
Question 175018: Can you please help me with the constraints on this linear programming question?
Trenton, Michigan, a small community, is trying to establish a public transportation system of large and small vans. It can spend no more than $100,000 for both sizes of vehicles and no more than $500 per month for maintenance. The community can purchase a small van for $10,000 and maintain it for $100 a month. The large vans cost $20,000 each and can be maintained for $75 per month. Each large van carries a maximum of 15 passengers, and each small van carries a maximum of 7 passengers.
Click here to see answer by Mathtut(3670) |
Question 175594: :))
Fix-It-Fast Plumbing charges $25 for a house call and $50 for each hour
spent on the job. Do-It-Right Plumbing charges $35 for a house call
and $45 for each hour spend on the job. How many hours must be spent
on the job in order for the charges of the two plumbing companies to
be equal?
Click here to see answer by Mathtut(3670) |
Question 175595: Writing In a system of three linear equations with three variables,
the number of solutions depends on how the planes defined by the
equations intersect. List the different numbers of solutions that are
possible, and explain when each occurs.
Click here to see answer by solver91311(16897)  |
Question 176608: graph each system of constraints. find all vertices. evaluate the objective function at each vertex to find teh maximum or minimum value..:)
*** all the < and > have lines under neath them.. so all the arrows are equal or greater than...
1)x<3
y<7
x>0,y>0
maximum for p=2x+3y
2) 2x+y<30
x+y<20
x>0, y>0
minimum for c=x+4y
Click here to see answer by Fombitz(13828)  |
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