Mathematics - 1 July 2007

Solve this problem for A and B. show steps.

2007-07-01 18:24:37 · 4 answers · asked by Stirling 2

2007-07-01 18:07:03 · 7 answers · asked by Anonymous

Solve for the unknown: 8/52 = m/39.. I just need it explained, i will do the work. Thank you

2007-07-01 18:05:11 · 6 answers · asked by Anonymous

A cylinder is inscribed in a right circular cone of height 8 and radius (at the base) equal to 4 . What are the dimensions of such a cylinder which has maximum volume? What is the height and radius:

Here is what I have:

plotting the cone on a graph gives me points:
(0,8) - tip of cone
(4,0) - radius of cone

from this, i figure out the formula of the line that is tangent to the point that the tip of the side of cylinder touches:

y= mx + b = -2x+8

The formula for the volume of a cylinder is V=pir^2h

the formula for the line can be changed in terms of r anfd h (radius and height respectively) to be:

h = -2r+8

Plugging this into the eqn: V=pi*r^2*(-2r+8)

But then... I get stuck - if i differentiate, I still have two variables dV/dx and r.

Is the process wrong? Have I skipped something?

2007-07-01 17:50:41 · 5 answers · asked by Anonymous

Please coul you explain the way you get the ansa, I asked this before but had very different ansa's like 9kg, 12kg, 8kg so I dont know who is correct.

Thank you very much guys!

2007-07-01 17:43:03 · 4 answers · asked by Anonymous

2007-07-01 17:41:08 · 13 answers · asked by Anonymous

same as tan[sin^-1 (x)]

how do you simplify that? Im working on trig substitution and trying to simplify it but I dont know how. My calculator gives me the answer but I dont understand how it gets it

2007-07-01 17:39:37 · 6 answers · asked by nkarasch 2

A cube is made from cardboard 12cmx18cm what is area of 1 face of the cube?

Thanks guys. Could you put formula too?

2007-07-01 17:34:58 · 9 answers · asked by Anonymous

Please help me and explain the steps you use. THANKSSS!

evaluate z/w^3 in the form a + bi when the following conditions apply:

z= sqrt(3) + i
w= 1 + sqrt(3)i

2007-07-01 17:29:32 · 1 answers · asked by Anonymous

Please could you explain the formula thank you maths wiz!

2007-07-01 17:13:54 · 18 answers · asked by Anonymous

A laundry company is selling a liquid and powder version of their soap. They did a survey and 5/7 said they used liquid, 1/3 said they dont use powder, 183 said they use both, and 20% said they use neither. How many people were surveyed?

2007-07-01 17:11:05 · 5 answers · asked by Christy R 1

2007-07-01 16:37:17 · 10 answers · asked by J 6

builder has a wooden board measuring 231" long. She needs to cut this board into 20 separate boards. What should the length of each board be?

2007-07-01 16:18:51 · 4 answers · asked by Anonymous

I am having a bit of trouble with this question; I know it is simple but I cannot get to the answer and I keep screwing up.

Here's the problem:

Find the values of the variables a, b, c, d, and e if they meet the following conditions:

a(b+c+d+e)=128
b(a+c+d+e)=155
c(a+b+d+e)=203
d(a+b+c+e)=243
e(a+b+c+d)=275
I think this has to be done by subtracting the total values from related conditions such as in the 1st 2 math sentences;
(ba+bc+bd+be)-(ab+ac+ad+ae)= 155-128= 27
However this keeps messing up and so far I could only think of this.
I need work too, not just the answer...
This is sort of urgent...

2007-07-01 16:04:39 · 5 answers · asked by Anonymous

1.m to the sixth power. please find the root.
2.cube root of 5b to the nineth - use product rule to simplify
3. 9/144 root
4. 32 inside the root box with small 4 to the outside left of the root.--use product rule to simplify. thanks

2007-07-01 16:00:40 · 4 answers · asked by linda c 1

How long will they take together to wash 1000 dishes?

2007-07-01 15:58:15 · 15 answers · asked by Anonymous

2007-07-01 15:47:28 · 5 answers · asked by Anonymous

Six cups of flour are required to make a batch of cookies. How many cups of flour are needed to make enough cookies to fill 12 cookie jars, if each cookie jar holds 1.5 batches?

2007-07-01 15:46:33 · 5 answers · asked by kill 1

Hi. For those of you that are mathematicians or grad students in math, what's the hardest concept or area of study EVER in the entire history of math that you've encountered or heard of?

Can you explain in simple terms what made it so difficult?

2007-07-01 15:42:41 · 5 answers · asked by Anonymous

How many 3-person groups can be formed in a club with 8 people?

2007-07-01 15:37:41 · 3 answers · asked by kill 1

how can i find the product? i appreciate your help!

2007-07-01 15:24:52 · 8 answers · asked by Anonymous

2007-07-01 15:13:41 · 7 answers · asked by Carlos A 1

2007-07-01 15:09:49 · 4 answers · asked by Anonymous

log(x) + log(2x) = 10

2007-07-01 14:20:34 · 4 answers · asked by Anonymous

There are 5 hippos & when weighed in pairs the weights were:
100, 200, 300, 400, 500, 600, 700, 800, 900, 1000lbs

2007-07-01 14:12:56 · 1 answers · asked by LISA R 1

2007-07-01 14:12:27 · 5 answers · asked by Dylan P 2

I am tyring to find out what a & b equal. Please explain how you got answer.

2007-07-01 14:09:18 · 3 answers · asked by LISA R 1

2t^4x^4 -32x^4

2007-07-01 14:08:32 · 3 answers · asked by Anonymous

Communitave
Associative
Identity or Distributive?
I am so lost....help people please :)

2007-07-01 13:45:37 · 6 answers · asked by Poetry 1

Please help!!!!

2007-07-01 13:40:19 · 5 answers · asked by Poetry 1