Mathematics - 11 December 2007

These numbers are worth 20 percent of a persons grade
85, and 80
87 is worth 25 percent of the persons grade
and 88 is worth 25 percent of a persons grade.

What number grade does the person end up with?

2007-12-11 15:29:22 · 3 answers · asked by smiles 2

y = 4 - 5x

how do you rearrange this so it is in slope-intercept form?

2007-12-11 15:27:17 · 3 answers · asked by Anonymous

2007-12-11 15:22:07 · 4 answers · asked by Anonymous

Find the parametric equations for the line of intersection of planes:

z= x+y, 2x-5y-z=1

Is it possible to set any x,y,z point equal to 0?

For instance my book sets x=0 and they get the points (0, -1/6, -1/6) & get the resulting parametric equations x=6t, y=(-1/6)+t, z=(-1/6)+7t

but when I did it I set z=0 and got points (1/7, -1/7, 0). I would get different parametric equations. Is this wrong?

2007-12-11 15:20:43 · 5 answers · asked by manutd84 1

I'm familiar with the General Rule: U^n du , but I don't think it will work in this case.

please help!

2007-12-11 15:09:03 · 7 answers · asked by Conservative Jesus 1

i dont get how to solve this algebra 2 question?!?!?! the x2 in the problem is x squared in case that was confusing =)...
but yea i just really dont know how to set it up!

2007-12-11 15:03:57 · 9 answers · asked by angeltearz27 2

2007-12-11 14:51:51 · 5 answers · asked by Anonymous

e ^ 8x over e ^ 4 equals e^2x

I am sorry for... putting math equation like this but...
the answer says this equation is SOMETIMES TRUE
can anyone tell me why?? and explain how to solve this kind of problem?? like... state whether the equation is true or sometimes true or never...

thank you so much

2007-12-11 14:30:43 · 3 answers · asked by melong_91 1

my essay is about greek mathematics
my thesis has to be on the whole thing not just a certain segment of it
this is as far as i got
without the greek mathmatics, science, architechture, and modern math wouldnt have evolved like it did in the past
i know this isnt a thesis but i cant really think of a way to make it into a thesis
please please please please please please please please
i really need help on this

2007-12-11 14:28:41 · 5 answers · asked by Sydney 3

help

2007-12-11 14:24:18 · 3 answers · asked by Crystal S 2

Suppose the graph of y=x^2 is shifted to obtain each the following graphs. What is the equation of the function, g(x) for each graph

2007-12-11 14:22:40 · 4 answers · asked by Anonymous

a) A point moves on the hyperbola 3x^2 - y^2 = 23 so that its y-coordinate is increasing at a constant rate of 4 units per second. How fast is the x-coordinate changing when x = 4?
b) For what values of k will the line 2x + 9y + k = 0 be normal to the hyperbola 3x^2 - y^2 = 23?

2007-12-11 14:15:37 · 1 answers · asked by Alejandro 1

A rectangular piece is trimmed to make a square by cutting 4cm off top and 2cm off one side. If the area of the original piece is 74 cm greater than the area of the square, find the dimensions of the rectangle.

2007-12-11 14:06:12 · 1 answers · asked by Anonymous

Can anyone explain to me why this statement is wrong?

Any curve that is always on or above the horizontal axis can be the density curve for some distribution.

Also, how would I modify this statement to make it correct?

Thanks!

2007-12-11 13:56:35 · 1 answers · asked by Bethany 2

Given the function f defined for all real numbers x by f(x) = 2 |x - 1|x^2.
a) What is the range of the function?
b) For what values of x is the function continuous?
c) For what values of x is the derivative of f(x) continuous.
d) Determine the value of I = integral (1; 0) f(x)dx.

2007-12-11 13:55:21 · 1 answers · asked by Alejandro 1

1. Find the derivative for f(x) = 3 - the absolute value of (X-3)
2. Find the derivative of f(x)= (the absolute value of (X+3)) - 1

2007-12-11 13:53:44 · 1 answers · asked by Anonymous

On a given interval, why is the "particle farthest to the left" when the function is at its absolute minimum? Why not at the point at the negative-most end of the given interval (i.e. at x=0 on interval [0,2])?

2007-12-11 13:50:53 · 1 answers · asked by veggies<3 1

Let f be the real-valued function defined by f(x) = sin^3x + sin^3 |x|.
a) Find f'(x) for x > 0.
b) Find f'(x) for x < 0.
c) Determine whether f(x) is continuous at x = 0. Justify your answer.
d) Determine whether the derivative of f(x) exists at x = 0. Justify your answer.

2007-12-11 13:50:46 · 2 answers · asked by Alejandro 1

A. minimum

B. Maximum

2007-12-11 13:41:38 · 12 answers · asked by Anonymous

Consider the extension E=F(x_1) of F=Q(a_0,...,a_4). Show that if E is contained in a radical extension of F then so is F(x_i) for each i and ehence so is F(x_1,...,x_5) = Q(x_1,...,x_5).
Any help is greatly appriciated.

2007-12-11 13:39:40 · 1 answers · asked by Anonymous

2007-12-11 13:33:13 · 3 answers · asked by kondiii 1

1. I am confused about max/min & 1st/2nd derivative. I thought the first derivative gives you max/min; but does the 2nd derivative just verify it or something?

2. I need help with this related rates problem (like how to set it up/START it):
V=1/3(pie)r^2h
*If you pour liquid in a container at 6 cubic feet per minute; the container has a height of 7 feet and the radius is 4 feet. What is the rate the liquid is rising in the container when the liquid is 3 feet deep?

3. How does a tangent line 'approximation' compare to finding the equation of a line tangent to a curve?

4. How are the mean value theorem and the intermediate value theorem related...in terms of derivatives?

5. If you have a limit problem, how do you know when to use the squeeze/sandwich theorem??? In general, WHEN do you use the aforementioned theorems?

6. How do you find the length of an interval (in regards to the bisection method)?

Thanks!

2007-12-11 13:29:28 · 1 answers · asked by StarrySprinkes 3

2007-12-11 13:25:47 · 16 answers · asked by z0nezero 1

Distribute twenty apples among ten students in class, 20/10 = 2 apples for each student
And, distribute ten apples among ten students in class, 10/10 = 1 apple for each student
Now, distribute ten apples when there is zero student (no students in the class). 10/zero= then why it is always infinity for each student. And why is not = 0 or 10 ( because nothing is distributing and 10 apples are still there waiting for distribution) OR impossible division.

2007-12-11 13:01:14 · 5 answers · asked by ? 3

solve each equation

m(squared)-24m=-144

determine whether each trinomail is a perfect square trimonial if so factor it. t(squared)+16t-64

2007-12-11 12:59:44 · 1 answers · asked by Anonymous

2007-12-11 12:58:45 · 0 answers · asked by Simone P 1

Here's the problem:
There is a kayaker that goes upstream 15 miles and back again in 32 minutes. If the current is 5 m/hr then what is the paddlers speed? Please help!

2007-12-11 12:49:22 · 1 answers · asked by Bran muffin 1

Each student listed has taken 3 math tests. Find the score each student needs on the next test in order to have an 80 average!!?!?!
(test 1 then 2 then 3 then the line is where the answer goes)
Bill-78,78,78 _____
Jill-68,79,74 _____
Phil-72,82,82 _____
Will-91,64,76______

PLEASE HELP! i don't get it!

2007-12-11 12:44:07 · 10 answers · asked by dancerkinzi 1

Write x= -2 in standard form using only integers and a positive coefficient for x?

Ok so I have two points (-2,2) and (-2,0) so the slope is undefined and the only equation I have is X= -2 but i have to make into standard form with a positive coefficient for x. choices for answers are:
a) x+3y= 6
b) x-3y= 2
c) -x+3y= -6
d) x-3y= 6

please help, ive tried solving for x to get -2 and using the coordinates also but nothing works!

Additional Details

technically its a two part question, in the first one it gave me the points (-2,0) and (-2,2) and asked for the slope which came to 2/0 or undefined since you cant divide by 0. the second problem is exactly worded:

Write the equation in standard form using only integers and a postive coefficient for x.

2007-12-11 12:43:31 · 2 answers · asked by Aquamarine 3

I need help getting to the answer of this question.

Mr. R , a college instructor, can grade his class papers in 3 hours while it takes his assistant 4 1/2 hours. If Mr. R graded the papers for 1 hour and then left the job for his assistant to complete, how long will it take his assistant to finish grading papers?
Answer = 1/3 hours

This is what i did and i still can't get the answer
1/3 + (1/4.5)x = 1

2007-12-11 12:40:20 · 4 answers · asked by KoF 2