Science & Mathematics - 26 July 2007

1. Use any method for solving the following system of equations:
x - 3y = 12
2x + 5y = -20

A. (6,-2)
B. (-5,-2)
C. (0,-4)
D. (12,0)

2. Mike paid $54 for his greens fee and three sleeves of balls. Matt paid $42 for his greens fee and one sleeve of balls. How much did a sleeve of golf balls cost?

A. $12
B. $6
C. $8
D. Not enough information given

3. Change this standard form equation into a slope intercept form:

3x - 4y = 24

A. y = ¾x + 24
B. y = ¾x - 6
C. 4y = -3x + 24
D. y = -3x + 8

4. (3,4) is a solution to this equation:
4x + 3y = 12

A. True
B. False

SOLVE

5. y = -1x + 4
6. y = 3x - 4
7. y = ½x + 5

8. Choose the TWO equations that represent parallel lines.

A. y = ½x + 4
B. y = ½x - 6
C. y = 2x + 4
D. y = -½x + 8

2007-07-26 07:16:40 · 5 answers · asked by Sunshine 1 in Mathematics

a. gram formula mass
b. gram atomic mass
c. gram molecular mass
d. atomic mass

2007-07-26 07:16:20 · 6 answers · asked by Anonymous in Chemistry

I understand that many animals are not expected to live long because of predators etc..., but what animals would live the longest if allowed to live their life to the point of a natural death?

2007-07-26 07:12:57 · 28 answers · asked by BR 3 in Zoology

2007-07-26 07:12:49 · 4 answers · asked by Mc K 2 in Mathematics

2007-07-26 07:11:15 · 7 answers · asked by jonaman_12 3 in Weather

this question had been hard to answer by many scientists, not because they can't predict what will happen in the future but vecause simply they will never have such thing, but I have another opinion and by the way, don't give any formulas and answers you think if you choose LONG words in it yo would answer right, or think that you have answred right

2007-07-26 07:03:36 · 8 answers · asked by Anonymous in Physics

okay so i have an algebra 2 final in like 2 hours and i need help with 2 problems, please help me as much as you can

x^2-2x-8=4

and

64x^4/3
_______
x^-2/3

all times ^ 1/2

2007-07-26 06:56:15 · 1 answers · asked by Anonymous in Mathematics

2007-07-26 06:49:41 · 3 answers · asked by spainvirandagreen 1 in Astronomy & Space

I did look this up online one time & there seems to be argument among Mathematicians as to whether there is a -0 & a +0, or whether 0 is just 0. I was always taught the latter of these two when studying Math & learning about "Negative Numbers". Thank You to All who respond to the question here.

Also; How would a -0 be used, if it exists, etc?

2007-07-26 06:46:53 · 18 answers · asked by ? 6 in Mathematics

2007-07-26 06:45:33 · 20 answers · asked by Jeremy W 1 in Astronomy & Space

2007-07-26 06:45:12 · 8 answers · asked by nancy_marzola 2 in Astronomy & Space

1. Choose the TWO equations that represent parallel lines.

A. 2x - y = -4

B. x - 2y = -8

C. x + 2y = -8

D. x - 2y = 12

2007-07-26 06:44:41 · 11 answers · asked by Sunshine 1 in Mathematics

Given f(x) = 5x2 – 3x + 1, find f(–2).

A) 15 B) 27 C) –13 D) –25

2007-07-26 06:43:44 · 3 answers · asked by Anonymous in Mathematics

The length of a rectangle is 8 in. more than twice its width. If the perimeter of the rectangle is 64 in., find the width of the rectangle.

A) 8 in. B) 9 in. C) 10 in. D) 7 in.

2007-07-26 06:41:58 · 2 answers · asked by Dawn M 1 in Mathematics

Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?

A) $11,000 B) $12,000 C) $8,000 D) $13,000

2007-07-26 06:39:17 · 3 answers · asked by Dawn M 1 in Mathematics

2007-07-26 06:37:16 · 7 answers · asked by wolfey 1 in Mathematics

x^2-8x+16

Thank you!

2007-07-26 06:36:11 · 4 answers · asked by Brandon 1 in Mathematics

Pedro raced 96kilometers from Perry to Medford and then idled back. If the round trip took 8 hours, what was Pedro's average speed?

Please help! I'm really confused! Please Explain! Thanks!

2007-07-26 06:36:02 · 3 answers · asked by Anonymous in Mathematics

2007-07-26 06:34:47 · 3 answers · asked by wolfey 1 in Mathematics

Co, O2, NH3, H2O. . I think it is Co but not sure? ?

2007-07-26 06:32:47 · 8 answers · asked by Anonymous in Chemistry

My mum always catches them in a glass and they can't get out, till she puts them outside. Why is this and can you tell me your source. Thanks y'all.

2007-07-26 06:30:39 · 13 answers · asked by Anonymous in Zoology

2007-07-26 06:29:02 · 2 answers · asked by mela 1 in Chemistry

a) butanal and b)cyclohexanone

2007-07-26 06:27:00 · 5 answers · asked by mela 1 in Chemistry

I am just beginning to study Physics and while learning about Newton's Laws I have seen the symbol when comparing two quantities, such as the masses of different objects. It looks similar to two greater-than symbols right next to each other, such as ">>" except the one on the right is slightly larger. If anyone can help it would be greatly appreciated. Thanks

2007-07-26 06:26:22 · 3 answers · asked by Mark the man 2 in Physics

2007-07-26 06:20:25 · 6 answers · asked by Erin M 1 in Weather

find the least common multiple of 8,12,and 20

2007-07-26 06:18:25 · 11 answers · asked by turlington999 1 in Mathematics

I have some boric acid powder and want to make a 2% solution. How do I measure the boric acid and put the right amount into the water to make 2%? Actually, it doesn't have to be exactly 2%. Even 3 or 4 percent would probably be okay. A "mild" solution, as it's to be used on the skin to try to kill tinea.

Can this be done by measuring with teaspoons? I am looking for a simple home method, I don't have any laboratory equipment.

2007-07-26 06:17:39 · 3 answers · asked by Marvin 1 in Chemistry

2007-07-26 06:15:27 · 9 answers · asked by freespaceshuttle 1 in Astronomy & Space

I just started taking it for migraines(even though it is an anti-depressant). And I am really tired and out of it.Does any1 know how long before the grogginess wears off?

2007-07-26 06:13:55 · 2 answers · asked by Anonymous in Medicine

I don't understand that. And also, why are some galaxies moving forwards while other are going away from us here?

Umm thanks.

2007-07-26 06:13:36 · 10 answers · asked by Pie 3 in Astronomy & Space