Mathematics - 23 August 2007

1. 2x-2y=2
x+2y=10

2. 4x+y=-11
3x-y=-10

3. 4x+3y=-23
3x-3y=-12

2007-08-23 13:34:52 · 5 answers · asked by --------????------- 1

my daughter want to know haha

2007-08-23 13:31:11 · 5 answers · asked by Anonymous

I dont know how to do this, because it will take to long to add up 100 numbers and divide it by 1000. So i need help!!!!!!!!!!!!

2007-08-23 13:31:06 · 6 answers · asked by Kay 1

Perform the operation (4x-2y)^2

2007-08-23 13:17:36 · 3 answers · asked by bealsey1 2

Q is the interior of angle ROS, S is the interior of angle QOP, P is the interior od angle SOt, angle Rot= 127 degrees angle sot = 71 and angle roq=angle qos= angle pot

please help me and plas sjow work thank you

2007-08-23 12:51:13 · 1 answers · asked by kyiyna aka keke bka ke 2

Find the slope of the tangent line to the curve r = 4 cosθ at the point where θ = pi/4.

Then the instructor had this formula: dy/dx = (dr/dθ)/(dr/dθ) =
(sinθ + r cosθ)/cosθ - r sinθ), which for some reason resulted (using r above): (-4sin^2θ + 4cos^2θ)/(4sinθcosθ - 4cosθsinθ). I know that dr/dθ = -4sin, however, I just don't see the correlation between the formula, the derivative of r, and the result she had. Any help is appreciated, thanks!

2007-08-23 12:32:35 · 2 answers · asked by Jorm 3

1.) if u knew how tall u were at the age of 2, u can estimate your adult height (in inches). girls can use the expression 25+1.17h where h is the height(inches) at the age of two. boys can use the expression 22.7+1.37h. estimate the adult height of each person to the nearest inch.

A.) a girl who was 34 inches at the age of two
B.)a boy who was 33 inches at the age of two

thanks so much! im horrable at algebra........

2007-08-23 12:31:27 · 1 answers · asked by ~♠•S•♠~ 3

help =)

2007-08-23 12:29:41 · 3 answers · asked by Anonymous

thanks

2007-08-23 12:24:35 · 3 answers · asked by Anonymous

We are measuring the IQ of students at a college. We choose a sample of 30 students, and find for the same a mean IQ of 118.3, with a standard deviation of 11.4. Find the 95% confidence interval for the population mean. I have the answer [114.221 to 122.379] but I want to know the step by step formula to use. I don't know the statistical symbols so if someone can write it out for me I would greatly appreciate it.

2007-08-23 12:24:27 · 2 answers · asked by Will B 1

isn't this the same as y=mx+b ?
rewritten as 7 = -4x + 2y......is the next step: y=-4/2x+7/2? if not, what is? and please explain.

2007-08-23 12:23:08 · 3 answers · asked by shayne t 2

a Ball is thrown vertically upward from the ground with an initial velocity of 60 feet per second. How high will the ball go?

a(t)=32 feet per second acceleration due to gravity

2007-08-23 12:23:03 · 2 answers · asked by yeshareg l 1

Help =(

2007-08-23 12:20:55 · 8 answers · asked by Anonymous

1.) -14 < 2j+ 3≤ 6

2.) -3 ≤-x- 5 ≤0

3.) -x+ 5 < 3x+ 1

2007-08-23 12:06:22 · 2 answers · asked by Juan C 6

Based on Data from three check ups, Tommy's mean height is 62 inch. At the first 2 checkups tommy's height was 58 in. and 61 in. What was his height at the third check up?
__________________________________
different question-


the ages of the participants in a race are 14,23,20,24,26,17,
21,31,27,25,14, and 28
Which measure of central tendency best represets the ages of the participants. EXPLAIN.

2007-08-23 12:03:17 · 4 answers · asked by Morgan 3

Please show steps...Thanks!

2007-08-23 12:00:28 · 8 answers · asked by Daniel J 1

i need help

2007-08-23 11:58:32 · 7 answers · asked by Anonymous

what are the two points from this equation so i can graph it

2x - 3y = 9

please if u can, explain

2007-08-23 11:57:54 · 7 answers · asked by Anonymous

this is the question: "describe a situation where you would need to add positive and negative integers."
it's so hard i can't explain!

2007-08-23 11:42:29 · 8 answers · asked by Anonymous

I need to know how to simplify the square root of 50

2007-08-23 11:40:51 · 4 answers · asked by Ashley M 1

A) 2x^2+x-12=0


B) 4x^2-2x=7



Please show all the steps so i understand for other questions

2007-08-23 11:20:24 · 4 answers · asked by erin j 2

2007-08-23 10:56:42 · 2 answers · asked by Anonymous

2007-08-23 10:37:49 · 4 answers · asked by Anonymous

9 over 7 + -2 3 over 14

2007-08-23 10:34:08 · 11 answers · asked by Mikey A 1

2007-08-23 10:33:57 · 8 answers · asked by Anonymous

2x^2 + 4
-----------
2x

2007-08-23 10:31:06 · 3 answers · asked by Anonymous

how do i tackle the above?

what is the step by step guide?

2007-08-23 10:29:30 · 8 answers · asked by Anonymous

I know the Jacobi symbol is typically all we can work with for composite N when attempting to discern whether a given residue A is a quadratic residue mod N.

However, what if we have a composite N with a special property (it will thus be a pseudoprime to base A): what if A^((N-1)/2) actually IS congruent to either 1 or -1 even though N is composite? Would this always be an accurate result for whether or not A is a quadratic residue mod N?

In other words, if A^((N-1)/2) mod N does equal 1, does that mean A is necessarily a quadratic residue mod N even for composite N? If it equals -1, does that mean A is necessarily a quadratic nonresidue mod N even for composite N?

2007-08-23 10:26:15 · 1 answers · asked by Anonymous

I thought I remembered learning this but when I worked it out,
I don't think I did it right,
so if you could help, and show the steps how you did it,
that would be great!! :)
Here's the problem:

3(4y-5)=69


thankyou again!

2007-08-23 10:17:33 · 20 answers · asked by sil. 2

If you assume there are three significant figures in the number, would 72,000 = 7.20 x 10^2 or 7.20 x 10^4? The significant numbers should be the "7,20" right?

If you write the following in standard, nonexponential form would 3.86 x 10^-6 = 0.00000386?

If you write that same number in common decimal form, is it the same? If so, why would it be specified to write them in "common decimal" instead of "standard, nonexponential" form?

Man, I thought I understood this stuff when I left class, haha...

2007-08-23 10:07:02 · 5 answers · asked by Anonymous