Mathematics - 9 June 2007

I'm helping my daughter with a math problem......here's the question:

Expenses = 5 + 12x
Income = 25 + 14x
Therefore, Profit = (25 +14x) - (5 +12x) right?

Now the question is.....How many sweatshirts "x" must be sold to "break even"?

The way I worked the problem was to make Profit "P" equal to zero. But when I do this, I come out with x = -10 shirts. I know that can't be right. What are we doing wrong? Please explain in detail so we can understand where we went wrong. Thanks!

2007-06-09 09:47:09 · 4 answers · asked by BusyMom 2

what is the sum of the equation, 2+2? im very confused.

2007-06-09 09:40:06 · 10 answers · asked by clever_username 3

using the numbers 1 3 4 6 not necessarily in that order use only the usualy operations of addition subtraction and or division to obtain a value of 24

2007-06-09 09:34:53 · 2 answers · asked by Anonymous

cause i cant seem to understand the methods on other sites

2007-06-09 09:21:24 · 10 answers · asked by joebeina 1

Find 55 out of 65 in percentage.

84.62%
15.39%
118%
.8462%

2007-06-09 09:19:57 · 7 answers · asked by Anonymous

in a right triangle, the measures of the legs are 7 and x-1, and the measure of the hypotenuse is x. Find the value of x.

2007-06-09 09:11:40 · 4 answers · asked by Anonymous

Derive a divisibility conjecture for 7^(2n) - 5^(2n) (other than divisibility by 2), that is true for all n E N. prove your conjecture using mathematical induction.

2007-06-09 09:09:51 · 2 answers · asked by Anonymous

2007-06-09 09:02:09 · 5 answers · asked by x0xtaylorx0x 1

lim (5^x - 3^x)/x
x-->0

If I plug in 0 for x, then I get 0/0.

So now I just have to use L'Hospital's rule. But I don't know how to get the derivitive of (5^x - 3^x)

The final answer is suppose to be: ln 5/3

2007-06-09 08:53:56 · 3 answers · asked by Cheat Sum 4

3/p +5/m=2
and you solve for m
would you start with this
(3+p)+(m+5) all divided by pm or not?
very confused

2007-06-09 08:48:47 · 14 answers · asked by Okay.... 3

The minute hand of a clock is 3.4 inches long. How far does its tip move in 20 minutes? Give your answer correct to one decimal.

2007-06-09 08:41:15 · 5 answers · asked by Anonymous

1. Write answer in lowest term

5u/14t multiply 2tu/3

2. Write this as a single rational expression
4x^3/5ak^3 - 3a^2y/10c^3k

3. Subtract and simplify
5/x-1 - 3-2x/x

Thank you

2007-06-09 08:14:14 · 4 answers · asked by CHRISTOPHER R 1

still on this algebra worksheet, explainations i get in text books are not useful...please show any work where able. thanks.

2007-06-09 08:08:38 · 4 answers · asked by warreaver67 1

Solve equation by making an appropriate substitution.
(x is the only number under the radical sign)

x + 7√ x - 8 = 0

2007-06-09 08:07:59 · 4 answers · asked by Keith M 1

ok heres the question...
A 12 ft tree casts an 8 ft shadow. At he same time, a radio tower casts a 30 ft shadow. how tall is the tower?

2007-06-09 08:01:05 · 11 answers · asked by Anonymous

5p^3t^2 + 25p^2t^3 - 30pt^4

i cant solve it

2007-06-09 07:58:11 · 5 answers · asked by BOL3N$ HOODPiiNC3$$ 1

a group of students were surveyed to find their favourite channeel from four given T.V channels.
the results

rte1=135degrees
rte2=45degrees
tv3=120degrees
tv4=60degrees

12 students replied that rte2 was their favourite channel.
how many students were surveyed?

''and plz after that one''

how many gave tv3 as their reply

2007-06-09 07:50:38 · 5 answers · asked by trace 1

northeast to an observation tower. The tower is 4 mi from A. and a ranger in the tower can see for a distance of 3.5 mi. For what length of road can the ranger see the tourist's car?

2007-06-09 07:42:00 · 3 answers · asked by Anna Q 1

2007-06-09 07:39:52 · 8 answers · asked by Adam S 1

2007-06-09 07:35:29 · 18 answers · asked by Chris B 1

with the GFC which is 3x

2007-06-09 07:33:10 · 8 answers · asked by BOL3N$ HOODPiiNC3$$ 1

2007-06-09 07:26:26 · 2 answers · asked by Terence 1

S = 1/(1 + 1^2 + 1^4)
+ 2/(1 + 2^2 + 2^4)
+ 3/(1 + 3^2 + 3^4)
+ 4/(1 + 4^2 + 4^4)
+ ..... .....
+ 200/(1 + 200^2 + 200^4).


Find the value of 80402 * S.



This question came from a local mathematical olympiad competition I had just a few weeks ago. I have finished it already but I am unsure of the answers. Note that no calculators are allowed, and also the answer is in integer form 0 < N <= 99999.

Please show how you do it.

2007-06-09 07:09:00 · 5 answers · asked by to0pid 2

Is there an easy way to remember how to do these problems?
6x2(squared) +17x+5=()()

2007-06-09 07:05:26 · 5 answers · asked by MJ 3

1: factor a^2 + b^2 using complex numbers

2: If the roots are 1+i , 1-i, what is the quadratic equasion?

Plz show work, because i have more questions similar to these. I dont wana post them because i actually wana try.

2007-06-09 06:58:40 · 6 answers · asked by Anonymous

Perpendicular
Hypotenuse
Polygon
Inscribe
Cosecant
Tangent
Unit
Decagon
Coincide
Geometry
Hero
Center
Axiom
Circle
Cone

2007-06-09 06:56:05 · 7 answers · asked by mr. cheeze 3

you have g(x) = -x^3 and you need to find g((x)) can anyone tell me the answer.

2007-06-09 06:48:41 · 4 answers · asked by wakka 2

I worked on this for about an hour and can not figure out how to set this up, my book gives no real examples, can someone help?

x² = 2x + 4 (solve by using quadratic formula)

2007-06-09 06:30:50 · 6 answers · asked by amy r 1

[(1/2)x + (1/3)] [(1/2)x - (1/4)]

2007-06-09 06:02:46 · 7 answers · asked by YUNGDON 1

how do you know from the definition of sine, that in a right triangle , the sine of an acute angle is always less then 1? How do you know that the cosine of an acute angle is always less than 1?

2007-06-09 06:01:37 · 7 answers · asked by Physics 101 1