Tutors Answer Your Questions about Systems-of-equations (FREE)
Question 34661: A pharmacist needs 6 oz of a 30% codeine solution, but he only has bottle of 20% and 50% codeine solutions. Find how many ounces from each bottle should be mixed for this prescription.
Click here to see answer by Paul(988)  |
Question 35015: Ok right now in algebra class we are learning about "standard form" w/ linear equations.. i don't really understand how to slove and i keep getting it wrong.. the formula for solving & answering it is Ax+By=C. Why i keep getting it wrong is when i do the problem, it always comes out as (example) 6=3x+5y, when it SHOULD come out to 3x+5y=6.. I just dont understand how i am solving it wrong!! help!!
Click here to see answer by stanbon(75887) |
Question 37198: Sorry,Just one or two more questions.Thanks for the last math problem,I understood it!I'm Still so confused about fractions,though.Help Me!!!!!!!
x/3 - y/2 = -10/3
-4x + 5y = 36
The Answer Choices Are (16/3,-2) (-3,14/3) (-4,4) (4,28/3)
I'M SO CONFUSED!!!!!!!!!1111
Click here to see answer by fractalier(6550)  |
Question 37203: Okay, I Promise This is the last math problem because my limit is 4.
I Understood the last one , but once I ran upon this one I Got confused again.
x + 4y =-19
-3x - 12y = 57
The answers are:dependent (-3,-4) inconsistent (-3,4)
When the problems threw in the dependent and inconsistent answers, I couldn't figure out the answer. Thank You So Much!
Click here to see answer by fractalier(6550) |
Question 38216: I can't seem to figure this one out. Any help is appreciated. Thank you!
The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r is the radius of the cylinder and h is the height of the cylinder. Suppose the volume of the can is 121 cubic centimeters.
a)Write h as a function of r.
b)What is the measurement of the height if the radius of the cylinder is 3 centimeters?
c)Graph this function.
Click here to see answer by fractalier(6550) |
Question 38206: Need Help badly. I don't understand at all.
2) The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r is the radius of the cylinder and h is the height of the cylinder. Suppose the volume of the can is 121 cubic centimeters.
a) Write h as a function of r.
Answer:
Show work in this space.
b) What is the measurement of the height if the radius of the cylinder is 3 centimeters?
Answer:
Show work in this space.
c) Graph this function.
Show graph here.
Click here to see answer by fractalier(6550) |
Question 38205: 1) An open-top box is to be constructed from a 4 by 6 foot rectangular cardboard by cutting out equal squares at each corner and the folding up the flaps. Let x denote the length of each side of the square to be cut out.
a) Find the function V that represents the volume of the box in terms of x.
Answer:
b) Graph this function and show the graph over the valid range of the variable x..
Show Graph here.
c) Using the graph, what is the value of x that will produce the maximum volume?
Answer.
Click here to see answer by fractalier(6550) |
Question 38309: We have threee adults who have collectively have math degress, MBA and a 12 year old with a problem that none of us came arrive at the equation. It reads as folows:
The difference of a number from 8 is 3 more than the product of the same number and five.
This is a bit of an embarassment as I am visiting my nephew and he is having fun watching us try to dome with this answer.
Hope you can help.
Thanks
Deborah Linsley
Click here to see answer by Nate(3500) |
Question 38309: We have threee adults who have collectively have math degress, MBA and a 12 year old with a problem that none of us came arrive at the equation. It reads as folows:
The difference of a number from 8 is 3 more than the product of the same number and five.
This is a bit of an embarassment as I am visiting my nephew and he is having fun watching us try to dome with this answer.
Hope you can help.
Thanks
Deborah Linsley
Click here to see answer by Paul(988) |
Question 38309: We have threee adults who have collectively have math degress, MBA and a 12 year old with a problem that none of us came arrive at the equation. It reads as folows:
The difference of a number from 8 is 3 more than the product of the same number and five.
This is a bit of an embarassment as I am visiting my nephew and he is having fun watching us try to dome with this answer.
Hope you can help.
Thanks
Deborah Linsley
Click here to see answer by askmemath(368) |
Question 38411: Need help answering this question please. Have to have it done by tonight.
3) The formula for calculating the amount of money returned for deposit money into a bank account or CD (Certificate of Deposit) is given by the following:
A = P(1+ r over n)^nt
A is the amount of returned
P is the principal amount deposited
r is the annual interest rate (expressed as a decimal)
n is the compound period
t is the number of years
Suppose you deposit $20,000 for 3 years at a rate of 8%.
a) Calculate the return (A) if the bank compounds annually (n = 1).
Answer:
Show work in this space. Use ^ to indicate the power.
b) Calculate the return (A) if the bank compounds quarterly (n = 4), and carry all calculations to 7 significant figures.
Answer:
Show work in this space .
c) Calculate the return (A) if the bank compounds monthly (n = 12), and carry all calculations to 7 significant figures.
Answer:
Show work in this space.
d) Calculate the return (A) if the bank compounds daily (n = 365), and carry all calculations to 7 significant figures.
Answer:
Show work in this space.
e) What observation can you make about the increase in your return as your compounding increases more frequently?
Answer:
f) If a bank compounds continuous, then the formula becomes simpler, that is A=Pe^rt
where e is a constant and equals approximately 2.7183. Calculate A with continuous compounding.
Answer:
Show work in this space
g) Now suppose, instead of knowing t, we know that the bank returned to us $25,000 with the bank compounding continuously. Using logarithms, find how long we left the money in the bank (find t).
Answer:
Show work in this space
h) A commonly asked question is, “How long will it take to double my money?” At 8% interest rate and continuous compounding, what is the answer?
Answer: Show work in this space.
Click here to see answer by Nate(3500) |
Question 39333: This is actually a word problem.
A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create a 100lb mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?
Click here to see answer by checkley71(8403) |
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