Tutors Answer Your Questions about Linear Algebra (FREE)
Question 423579: I am confuse some could someone help please.
Explain the domain and range of a function. Under what circumstances would the domain be something other than "all real numbers"? Provide an example of a function whose domain does not include all real numbers.
Click here to see answer by scott8148(6628)   |
Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped...
(s+t)(s-t)(s+t)(s-t)
The answer provided in her book is:
s^4-2t^2s^2t^2
I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2.
If you can tell me what I'm doing wrong, I'd appreciate it.
I came up with:
(s)(s)(s)(s) = s^4
(t)(-t)(t)(-t) = t^2
I am so confused right now, I don't know what to do. It's been years since I had Algebra.
Click here to see answer by shree840(260)  |
Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped...
(s+t)(s-t)(s+t)(s-t)
The answer provided in her book is:
s^4-2t^2s^2t^2
I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2.
If you can tell me what I'm doing wrong, I'd appreciate it.
I came up with:
(s)(s)(s)(s) = s^4
(t)(-t)(t)(-t) = t^2
I am so confused right now, I don't know what to do. It's been years since I had Algebra.
Click here to see answer by mananth(12270)  |
Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped...
(s+t)(s-t)(s+t)(s-t)
The answer provided in her book is:
s^4-2t^2s^2t^2
I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2.
If you can tell me what I'm doing wrong, I'd appreciate it.
I came up with:
(s)(s)(s)(s) = s^4
(t)(-t)(t)(-t) = t^2
I am so confused right now, I don't know what to do. It's been years since I had Algebra.
Click here to see answer by Alan3354(30958)  |
Question 431841: The stretch in a wire under a given tension varies directly as the length of the wire and inversely as the square of its diameter. If the length and the diameter of a wire are both doubled, what is the effect on the stretch of the wire?
Please and thank you!! :)
Click here to see answer by mananth(12270) |
Question 432426: Mary has two tanks of fish. If she transfers 15 fish from the larger tank to the smaller tank, then the number of fish in the smaller tank will be 5/7 of fish in the larger tank. Given that there are 35 fish in the smaller tank originally, find the number of fish in the larger tanik before the transfer of fish.
Click here to see answer by belle3833(46)  |
Question 432428: As part of the 'learning journey'program, 73 pupils travelled on two buses, one air-conditioned and one non-air-conditioned, to the Singapore Discovery Centre. Three-fifths of the pupils on the air-conditoned bus were girls. There were 17 boys in the non-air conditioned bus. The number of girls on the two buses were equal. How many pupils were there on the air-conditioned bus?
Click here to see answer by htmentor(788)  |
Question 436290: I think I picked the right area for this [?].
I am at a loss to set this one up in formulas.
I get the rate/minute idea but get lost setting up an equation to get the answer.
Thank you.
A fire engine starts pumping water at 9:20 am at the rate of 800 gallons per minute. Another fire engine, pumping at the rate of 1,000 gallons per minute, starts at 9:30 am. At what time will the 2 engines have pumped the same number of gallons?
Click here to see answer by ankor@dixie-net.com(15623)  |
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