Mathematics - 1 October 2007

2007-10-01 23:52:05 · 9 answers · asked by SOSme 1

2007-10-01 23:36:02 · 3 answers · asked by george 1

determine, by considering the discriminant, the number of points of intersection with the x axis of the following parabolas

1)y=x^2-7x+3

2)y=5-7x-2x^2

3)y=3x+2x^2

2007-10-01 23:21:33 · 3 answers · asked by Anonymous

need help, when doing this shouldnt + come before - or don't this matter when multiplying?

2007-10-01 22:33:14 · 8 answers · asked by chas_lynn2002 2

Question:

P(5,0), Q(8,6), R(5,8), S(2,6). Find the area of the kite PQRS.


Pls. anwer it i need it right now please... please...

2007-10-01 22:24:09 · 4 answers · asked by Anonymous

A crystal growth furnace is used in research to determine how best to manufacture crystals used in electronic components for the space shuttle. For proper growth of the crystal, the temperature must be controlled accurately by adjusting the input power. Suppose the relationship is given by:

T(w)= 0.1w^3+2.155w+20
where T is the temperature in degrees Celsius and w is the power input in watts:

a) how much power is needed to maintain the temperature at 200 degrees Celsius?

b) if the temperature is allowed to vary from 200 degrees Celsius by up to plus or minus 1 degree Celsius, what range of wattage is allowed for the input power?

c) in terms of the epsilon, delta definition of lim, as x approaches a, f(x)=L, what is x? what is f(x)? What is a? what is L? What value of epsilon is given? What is the corresponding value of delta?

2007-10-01 22:17:29 · 2 answers · asked by Anniepannie06 2

1) Suppose that we have two events A and B with probabilities P(A)=.40 and P(B)=.60 and P(A intersect B)=.20. What is the conditional probability of P(B|A)?

2) Find the probability for P(X) U P(Xc) ?

3) We have a Venn Diagram with two events represented by sample space A and B, and these sets are: A={a,b,c,d} and B={a,a,d,d}
If we represent P(A) U P(B), we will highlight the area in the diagram where?

A) A and B share space and this area will include only a and d elements.
B) all of A and B's shared space and this area will include a, b, c, and d.
C) The area outside of A and B events and this area will include a, b, c, and d.
D) The area of A and B that is not shared and this area will include b and c.

Please explain the solving process.. Thank you.

2007-10-01 22:15:33 · 3 answers · asked by Diaus 2

A(-10,2), B (12,-4)

2007-10-01 21:44:14 · 3 answers · asked by Anonymous

I just posted the question, "if something is .89 (cents) per sqaure foot, & I bought 8 feet, how much will it cost?"
...this pond liner I need to by is 8 feet by 20 feet, and I forgot to mention that.

2007-10-01 21:37:23 · 3 answers · asked by Cheyenne 2

Please enter your answer as an ordered pair in the form (x, y).

2007-10-01 20:55:41 · 4 answers · asked by Anonymous

Please enter your answer as an ordered pair in the form (x, y).

2007-10-01 20:53:56 · 3 answers · asked by Anonymous

the numbers of the grades D,C,B and A in a class were consecutive integers. the number of D's was the same as the sum of one-third the number of A's and half the number of C's. how many students received a B

2007-10-01 20:29:42 · 1 answers · asked by carlos t 1

Prove :
the summation (sigma) of (n choose k) *5^k where k is odd and starts from 1 to n = ( 6^n - (-4)^n ) / 2

2007-10-01 20:24:56 · 2 answers · asked by Anonymous

I just want to make sure I have the answer right. The problem is:

5 (x - 2) -2x + 1
----------------------
3

The line obviously means the whole top part is divided by 3. Thank you!!

2007-10-01 20:08:45 · 12 answers · asked by Anonymous

Im having trouble doing trigonometric functions without a calculator. I want to get the answer in fractions not in decimals. Is there an easy way? if so can u please show some examples as well? greatly appreciated!

2007-10-01 20:07:02 · 3 answers · asked by sulekha47 1

Will you make it? SHOW ALL OF YOUR STEPS PLEASE!

2007-10-01 19:54:44 · 8 answers · asked by i <3 u 1

pre cal prob

2007-10-01 19:42:15 · 3 answers · asked by Anonymous

pre cal problem

2007-10-01 19:37:16 · 1 answers · asked by Anonymous

Well this is part of a much larger problem involving all sorts of polynomials anyway i am stuck on this one particular part which involves a cubic where you know 2 points and half the stationary point of inflection the points given are as follows:

[45,0] , [32,-20] and the stationary point of inflection occurs at [?, -7]

Basically ur supposed to find the equation for the cubic. is it possible to do this or have i overlooked something? The cubic is part of a much larger diagram involving all sorts of parabolas, semi-circles and ellipses which we need to find the formula for in order to create a computer generated diagram. if need be i can upload a picture of the diagram for u guys to look at if u think i might have missed something.

2007-10-01 19:27:35 · 2 answers · asked by Mitch 2

2007-10-01 19:27:21 · 10 answers · asked by i <3 u 1

2007-10-01 19:20:13 · 12 answers · asked by i <3 u 1

The formulas r = 0.07t + 2.27 and w = 0.08t + 2.48 give an approximate model for the yearly average price r of a bushel of rye and w of a bushel of wheat over the past five years, where t is the number of years since 1994. What is the first year in which the price of rye exceeded $2.48/bu and the price of wheat exceeded $2.56/bu?

The price of rye exceeded $2.48 after 1997
The price of wheat exceeded $2.56 after 1995
Just need to verify that I got the right answers

2007-10-01 18:37:29 · 3 answers · asked by Lady E 1

Let's say I have a rectangular prism with known dimensions... how do I find the length of a diagonal that goes from one vertex to another vertex directly across (if you don't know what I mean, I can try to clarify better).

2007-10-01 18:33:48 · 5 answers · asked by Anonymous

2007-10-01 18:21:13 · 3 answers · asked by christina e 1

2007-10-01 18:20:47 · 3 answers · asked by albert o 1

four times the sum of three consecutive integers is 180. what are the integers?

the sum of an integer and the next greater integer is at most 13. write an ineqality to find the lesser integer. then solve for the lesser integer

* i really don't get it so i would really appreciate help! please & thank you

2007-10-01 18:18:22 · 10 answers · asked by jmacsgirlie75 2

Find the normals to the curve xy+2x -y = 0 that are parallel to the line 2x + y = 0

this is from a quiz on implicit differentiation

2007-10-01 18:12:35 · 4 answers · asked by Nrisa-Gire N 1

False:A function f is differentiable at c if its graph has a
tangent line at the point (c; f(c)).

on the other hand
True: If the graph of the function f has a tangent line at the point (c,f(c)) then f is differentiable at c.

2007-10-01 18:08:35 · 3 answers · asked by shevchenko 1

...using the elimination method to solve for the equation

5x +4y = -3

-7x - 8y = -3

... also using the the elimination method to solve this.

2x + 3y= -12

7x+ 7y = -28

and also by using substituting method

6x + 7y = -29

x= -2 - 4y

2007-10-01 18:03:18 · 8 answers · asked by studentez 1

1) what is the sum of the number of corners, sides, and edges on a cube?

2) In what year will the USA celebrate its tercentennial?

3) When John Hancock signed the Declaration of Independance, his age was a multiple of 13 and the sum of the digits was 12. How old was he when he signed the document?

4) The diameter of a tennis ball is 2.5 inches. How many tennis balls can fit in a can 2.5 across and 1 foot long.

5) The largest painting in existance is the "Battle of Gettysburg." it weighs 1792 more pounds than 5 tons. how many pounds does it weigh?

2007-10-01 18:01:08 · 7 answers · asked by Natalie 1