Cacher
Well-Known Member
exactly:
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The Homework Thread
- Thread starter GreenEarth
- Start date
01001001001000000111011101110101011000100010000001110101001000000110110101100011011001100110000101110010
Hawke
Well-Known Member
I always thought of most high school sciences as more of a brain exercise rather than an actually useful thing. Like make you analyze and shit. Physics is sometimes fun.
Cacher
Well-Known Member
Sorry just have to do this but
I am one of the top students in the maths extension, for the year above
mikeymagic
Well-Known Member
Cacher
Well-Known Member
I know no one cares. Its the INTERNET.
Donvittorio
Well-Known Member
I'm homeschooled
katphish
Well-Known Member
Well I'm Asian, your argument is invalid.
(naaah, jk... great job
... now solve my damn equation...)
Cacher
Well-Known Member
This reminds me so much to boobs.
Creeper
Well-Known Member
I'm schoolhomed.
kingjok3r
Well-Known Member
I can help with that =3
lacar1601
Well-Known Member
If you're trying to "simplify" this by getting the root out of the denominator, multiply the fraction by the conjugate. E.g. if you have (whole term + root term), its conjugate would be (whole term - root term). This will get you (whole term ^2 - root term ^2). Remember to keep the fraction at the same value: what you do to the denominator, you must also do to the numerator.
Cathykiddo
Well-Known Member
I love how most of this thread is just people saying what they're good at xD
I need help with these math problems.. I have no idea how to do them!
1. If the equation for calculating monthly yield is y = 1000(1.008)^m, what is the annual interest rate? In the equation m is the total number of months.
2. The radio-isotope protactinium-231 has a half life of 34,400 years. It is commonly found in sea-floor sediment. If a core-sample of the sea-floor contained only 3.125% of its starting value of protactinium-231, how old is the sample?
3. Cobalt-60 is used for medical purposes, mainly in radiotherapy. It has a half life of 5.25 years. If 1kg of cobalt-60 was purchased by a hospital in 2000, and forgotten in the mailroom for seven years (lol?), how much cobalt-60 was remaining?
4. Give the compound interest equation for an investment at 3.125% compounded six monthly.
Please elaborate - don't just give the answer. Thank youuu :]
I need help with these math problems.. I have no idea how to do them!
1. If the equation for calculating monthly yield is y = 1000(1.008)^m, what is the annual interest rate? In the equation m is the total number of months.
2. The radio-isotope protactinium-231 has a half life of 34,400 years. It is commonly found in sea-floor sediment. If a core-sample of the sea-floor contained only 3.125% of its starting value of protactinium-231, how old is the sample?
3. Cobalt-60 is used for medical purposes, mainly in radiotherapy. It has a half life of 5.25 years. If 1kg of cobalt-60 was purchased by a hospital in 2000, and forgotten in the mailroom for seven years (lol?), how much cobalt-60 was remaining?
4. Give the compound interest equation for an investment at 3.125% compounded six monthly.
Please elaborate - don't just give the answer. Thank youuu :]
GreenEarth
Well-Known Member
Number 2
So somewhere in your book there is probably an equation for exponential decay. It will explain the derivation of this equation better than I can. I just remember this from way back. So it gave you lambda (half-life) as 34,400 years. We don't need to worry about units as they should come out the same for time elapsed. The problem says 3.125% of the original sample is available. Ok so create a hypothetical sample size, lets say 5000 grams.
3.125% of 5000(x.o) grams is 156.25(x) grams. There you have your initial and final sample. Rearrange the equation and plug in the numbers. hint: You will get a number in the range of 100,000 years to 200,000 years.
EDIT: the next problem requires the same equation me thinks, but this time solve for final sample mass
EDIT 2: I completely fail at 1 and 4, sorry
someone will probably know it
lacar1601
Well-Known Member
Ok, for the time value of money problems (1 and 4), the key equation to think about is y = Principle*(1 + Interest Rate)^m. For 1, just focus on the base value of the power term. Remember to convert percentages into decimal values and vice-versa as applicable. The equation uses the decimal form. For 4, the equation is the same, do what GreenEarth suggested and "Plug that shit in!"