Mathematics - 3 October 2007

After expenses of $60.15 were paid, a club donated $878.85 in proceeds from a pancake breakfast to a local health clinic. How much did the pancake breakfast gross?

2007-10-03 16:42:23 · 3 answers · asked by Anonymous

2007-10-03 16:39:17 · 4 answers · asked by Anonymous

Problem: √(x+2)-x=0, Note: x+2 is in the square root, -x isn't.
I added x to the right hand column, then squared both √(x-2) and x to get rid of the square root.

This gave me: x+2=x²
I subtracted x and subtracted 2 to get: 0=x²-x-2
I factored to get 0=(x-2)(x+1)
This gave x=2, x=-1

When I redistribute 2 and -1 into the equation -1 doesn't work, but 2 does, so x=2. Is this the final solution?

2007-10-03 16:38:36 · 4 answers · asked by Bluefast 3

ive done these problems like 6 times and keep getting the same answers but they don't work when i check them. please help me...

7y - 2(y - 4) = 8y - (4y + 13)

= 7y - 2y + 8 = 8y - 4y -13
= 5y + 8 = 4y - 13
= 5y - 4y = -13 - 8
= y = -21

------------------

-6 + 10y + 18 = 4(2y - 6) - 8

= 10y + 12 = 8y -24 -8
= 10y + 12 = 8y - 32
= 10y - 8y = -32 - 12
= 2y = -44
= y = -22


(But when I go to check them, the variables dont work please help me and tell me what i am doing wrong)

2007-10-03 16:34:29 · 4 answers · asked by Anonymous

A=
2 -1 (is matrix)
3 6

a) write A as a product of elementary matrices.

b) use your result for a) to write A^-1 as a product of elementary matrices.

c) AB=
-3 5
1 2

solve for B?

2007-10-03 16:30:28 · 2 answers · asked by john m 1

A. y=x-2
B. y=x+2
C. y=2x-1
D. y=2-x

2007-10-03 16:30:18 · 12 answers · asked by pkbrauer 1

A.They have the same number of sides.

B.The total degree measure of the interior angles of each polygon is the same.

C.They have the same number of interior angles.

D. Their perimeters are equal.

2007-10-03 16:26:02 · 3 answers · asked by pkbrauer 1

Im having a math block. Can anyone please help me? I know this is so easy.

2007-10-03 16:24:24 · 11 answers · asked by Anonymous

company manufacturing x surfsboards a day:
(a)what is the rate of chang fo total cost when the level of production is 10 surfsboard a day?

2007-10-03 16:20:57 · 2 answers · asked by Anonymous

The question was does the integral of dx/(x^2+3x+2) from 0 to infinity converge or diverge, and if it converges what does it converge to.
I did the integral and all the work and came to:
limit as b approaches infinity of [ln(b+1)-ln(b+2)]-[ln1-ln2].
The correct answer is it converges to ln2. I can see how that answer is produced, the ln of infinity must come to a small number, and ln1 is zero leaving just a positive ln2. But how do I know that the ln(infinity) converges instead of diverges?

2007-10-03 16:17:13 · 4 answers · asked by rman1201 4

2007-10-03 16:12:01 · 12 answers · asked by Anonymous

what real value of x do the following vectors form a linearly dependent set in R3:

v1=(x, 1/2, 1/2), v2=(1/2, x, 1/2), v3=(1/2, 1/2, x)

my guess is that x can only be 1/2 because if you put the above vectors as the column of a matrix, say A, then u would try to see if Ax=0 would have nontrivial solutions (which means you should get a row of 0s when u row reduce the matrix, therefore i know 1/2 will definitely work). but is there any other number that will work ? if so how did u go about solving this (kind of) problem?

2007-10-03 16:07:32 · 1 answers · asked by Chris L 1

2007-10-03 16:07:05 · 1 answers · asked by Anonymous

for the 3x3 matrix ( ";" represents the end of a row)
[c,1,0; 1,c,1; 0,1,c], find all values of c, if any, that would make the matrix invertible. okay my own guess here c is anything but 0 (since 0 will make the first and second row identical, thus creating a all 0 row when u row reduce which means it's not invertible because u cannot obtain the identity matrix by row reducing) I suppose my real quesiton is the way to approach these types of problem in general. My thought is that any number that will create a 0 row when row reduce will obviously be excluded, but am I right in assuming that every other number will work therefore? or is there some other cases i need to look into?

2007-10-03 15:59:59 · 2 answers · asked by Chris L 1

2007-10-03 15:57:16 · 9 answers · asked by ruas slickyboy 2

Simplify. Write answers in the form a + bi, where a and b are real numbers.
(8 + 2i)(4 - 9i)
a =
b =

Simplify. Write answers in the form a + bi, where a and b are real numbers.
(3 - 4i)(3 + 4i)
a =
b =

Simplify. Write answers in the form a + bi, where a and b are real numbers.
(-3 + 4i)2
a =
b =

Simplify. Write answers in the form a + bi, where a and b are real numbers.
-1/6-9i
a =
b =

2007-10-03 15:54:59 · 4 answers · asked by mir d 1

and please show how you did it

2007-10-03 15:53:29 · 1 answers · asked by Anonymous

I'd like to see work to get me through this problem, if possible, the actual steps of proving it. Any help welcome, thanks!

2007-10-03 15:42:05 · 5 answers · asked by ash 2

that passes through(-4,5) if its zeros are 2+ sqrt( 3) and 2- sqrt (3)

2007-10-03 15:41:05 · 1 answers · asked by inderjitvirk2001 2

On a certain road map, 3 inches represents an actual distance of 10 miles. If two towns are 10 inces apart on the map, what is the approximate distance between the towns?

2007-10-03 15:38:58 · 7 answers · asked by Anonymous

the book keeps telling me to write in standard form the equation of the line.

and i just need to know the standard form formula
i think it has to do with ax+ something
help?

2007-10-03 15:38:57 · 11 answers · asked by foshizzle 1

2. What is the volume of a cube that measure 1 cm?
3. How many hundredths are equak to 1 tenth?
4. A fish tank has a length of 5 feet and width of 4 ft, and aheight of 4 ft. Which measurement should you use to find the volume of the fish tank?
5. What is 0.47 written as a percent?
6. What is another way to write 24/8?
7. Chris scored the following on his math quizzes 90, 96, 84, 92, 78. What is Chris's mean sore?

2007-10-03 15:37:20 · 4 answers · asked by rosemariestewart64 1

i need to find a joke about the metric system and im having the hardest time! help!

2007-10-03 15:36:54 · 2 answers · asked by Kyra :] 1

just need a little review lol

2007-10-03 15:35:07 · 5 answers · asked by Israel A 1

the carrotops (^) representing exponents of course.

i remember doing it in algebra last year but i'm not sure how it's done. like doesn't a^0 equal 1?

if someone can tell me how to solve it (and not just give me the answer) it'll be greatly appreciated and i'll choose the first person to do that as the best answer rather than someone that just gives me the answer.

so, please help! thanks.

2007-10-03 15:33:05 · 4 answers · asked by Anonymous

2007-10-03 15:29:50 · 4 answers · asked by Anonymous

prove it to me that it equals to tanx

2007-10-03 15:26:31 · 6 answers · asked by Anonymous

Each of the two congruent sides of an isosceles triangle is 8 in. less than twice the base. THe perimeter of the triangle is 74 in. WHat is the lenght of the base?

2007-10-03 15:25:33 · 4 answers · asked by ExpertTechAnswers 2

Thank you in advance.

2007-10-03 15:24:38 · 8 answers · asked by WizFan16 2

Here are the problems im confused with

it says to state whether the number given is a solution to the equation.




1. 14b = 56;b = 4

2. 32 = y divided by 8;y = 256

3. 52 = y divided by 6;y = 256

____________________________________________

Solve each equation. Then check each solution .
Show your work

1. 6v = 792

2. b divided by 18 = 21

3. 19m = 266

4. g divided by 52 = 18

5. z divided by 27 = 63

6. 58 = j divided by 71


WHo knows how to do this cause im confused on what to do i did the first few problems but the rest are giveing me trouble

2007-10-03 15:14:36 · 1 answers · asked by Austin 1