Mathematics - 5 September 2007

ok so i grabbed the wrong binder with my notes on how to do these equations, so i cant remember how to do them and its realy confusing how to add negatives positives and multiplying them! so can some one help explain how to do them!?
here are some equations i dont get...


For both equations x=3, y=2 and z=1


1) x² - y² + z²=



2) 3xy-yz+2

2007-09-05 10:16:04 · 6 answers · asked by Anonymous

algebra, math problem

2007-09-05 10:12:55 · 6 answers · asked by brent h 1

2007-09-05 10:08:06 · 1 answers · asked by adviceappreciated 2

i was just wondering what numbers are also called natural numbers. i can't remember lol

2007-09-05 10:02:28 · 4 answers · asked by Lo. 3

i have tried many different ways to tackle this problem. and just dont understand. help would be aprreciated... im not trying to cheat answers.


-1/3(8/3) divided by 1 over negative 1/3 minus 8/3 to the second power + 10.

10 points to whoever explains the best and gives correct answer.

2007-09-05 10:01:21 · 5 answers · asked by mister3791 3

P.S. what formula is used to solve this?

2007-09-05 09:57:58 · 2 answers · asked by Anonymous

write in a simplest form = 2 1/2 250 miles to 10 gallons
a.2 5/10
b. 25
c.25 1/10
d.10 2/5

11/5 -
a.1 2/5
b.1 1/5
c.2 1/5
d. 11 1/5

13/7 =
a.1 6/7
b. 1 3/7
c. 2 6/7
d. 2 1/7

2007-09-05 09:55:35 · 3 answers · asked by Macy H 1

a whole number is either prime or composite
true false explain

2007-09-05 09:53:51 · 5 answers · asked by pinoyboy412 1

If a person has contracts a bacteria, and each bacteria divides every 20 minutes, how many will they have after 40 hours?

The example they gave is this:
20 min: 2
40 min: 4
80 min: 8
etc.

I can't think of a way to do this without a long and very painful process, so please show me your work for it! Thanks!

2007-09-05 09:53:02 · 10 answers · asked by waa~chaa is a ninja 2

hello i got a math homework sheet and the following question appears:

the relation that is NOT a function is:

a) y = √x +2
b) y = -3/x
c) y= 2/x^2
d) x^2 + y^2 = 36

i know that a function is where x can only have one unrepeating value to it but i dont understand how to do this question

help will be very appreciated thanks alot

2007-09-05 09:52:35 · 5 answers · asked by Anonymous

and show work please ..

I dont know how to multiply fractions. =S =(

.. i can explain .. I would really appreciate your kindness =]

2007-09-05 09:52:25 · 8 answers · asked by Anonymous

Directions: Find one countereample to show that each conjecture is false.

Problem: The product of two postive numbers is greater than either number.


Thanks for any help, I don't know why I can't get it.
Please explain how you got the answer.
Thank you.

2007-09-05 09:51:18 · 1 answers · asked by Dolly 1

Please provide me with a link to a calculator.
Please, I do not want a lesson in how to do it by hand....

Thanx

2007-09-05 09:47:32 · 4 answers · asked by I need help 4

Can someone tell me what is the GCF of 180 & 54 By using prime factorization (tell me wht the prime factorization is too, and how u got there....) Thanks In Advance!!

P.S. First Right Answer WILL Be The Best Answer!!!!

2007-09-05 09:45:16 · 2 answers · asked by • LeeYo • 6

In a triangle angle a is 4 times angle b, and angle c is 20 less than angle b find the size of all the andlges

2007-09-05 09:42:36 · 7 answers · asked by Fly, Eagles Fly 4

5. Whats the sum of the prime numbers that are between 30 and 42?

7/8. Write the fractions 5 over 9 and 1 over 20 as decimal numbers.

9. Write 3 over 14 with a denominator of 42.

10. Reduce each fraction to lowest terms:
a.) 70 / 60
b.) 16 / 24
c.) 24 / 36

11. simplify. 169,211 divided by 10,000

12. simplify. 123.61311 times 100


please help, thanks:]

2007-09-05 09:42:07 · 8 answers · asked by k :) 2

Numbers have an even number of factors
true or false explain

2007-09-05 09:39:44 · 5 answers · asked by pinoyboy412 1

The question is very descriptive of what I need.

2007-09-05 09:38:01 · 4 answers · asked by damasta_007 1

plz help

2007-09-05 09:32:54 · 7 answers · asked by Anonymous

square root of x+5= 1+ the square root of x-2

2007-09-05 09:30:14 · 3 answers · asked by brandtster 2

1) What distance does a car travel if it moves due north at 50km/h for 2 hours, and then due south at 50km/h for 2 hours?

2) What is the cars displacement (from the above problem)?

I'm not exactly sure what the answer for this problem is. I mean, logically I think it would be zero..but in the back of my mind i'm thinking that that is not correct..any help here?

As for the displacement, if my answer is correct, which it probably isn't..it'd be zero..but I don't know!!

2007-09-05 09:27:43 · 3 answers · asked by Anonymous

2007-09-05 09:20:04 · 4 answers · asked by silva 2

i need help with this this question for Math class in 6th grade help please !

2007-09-05 09:17:56 · 5 answers · asked by pk 1

Example: At which grade do middle school students carry the heaviest book bags? Hypothesis: If students are in higher grades, then their backpacks will be heavier, because they have heavier textbooks.
Problem: Which class is easier to pass, math or science? What would the hypothesis be?
Problem: What side of the classroom is warmer? What would the hypothesis be?

2007-09-05 09:16:16 · 1 answers · asked by Anonymous

2007-09-05 09:15:49 · 6 answers · asked by Anonymous

3(x-4)=2x+7-3x

thank you Im really lost on this problem...

2007-09-05 09:05:31 · 3 answers · asked by kawaii_dumpling 1

Okay so some of you will probably think this stuff is easy but i just don't get it. If someone could please give me step-by-step instructions on how to figure out one/both of the following questions:

1. If john invests $2300 in a savings account with a 6% interest rate compounded annually, how long will it take until his the account has a ablance of $4150?

2. Determine how much time is required for an investment to double in value if interest is earned at the rate of 6.25% compounded annually.


And on a side note, I have the equation A=P(1+r/n)^nt - if i fill in the numbers that I know, how do I solve it if the variable is in the exponent?

2007-09-05 09:03:35 · 3 answers · asked by dunkn_donut 1

negative 4 square root of 1 + cos2x..plz help with pre cal

2007-09-05 09:01:37 · 4 answers · asked by silva 2

please show me step by step

2007-09-05 08:59:53 · 6 answers · asked by AnswerGirl 2

plz help with pre cal

2007-09-05 08:57:49 · 8 answers · asked by silva 2