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its either 2 or a variable seeing hat the answer is not given but a question mark has taken its place the question mark is (in this case) A variable so it can be any number therefore if 2 is incorrect the answer is pi because pi ( just like pie lol ) is an infinite term it is many numbers at once. -
I am studying to be a math matician in college and my professor siad that he has seen this sort of puzzle before so hahah I win wheres my money. > <
U

GuestJul 13, 2012

Anon:
n = 4
p = 16/(16+38)
P(X>=1) = 1 - P (X<1) = 1 - P (X=0) = 1 - (16/(16+38))^4

http://web2.0rechner.de/fragen/images/smilies/icon_cry.gif

GuestJul 13, 2012

+3146

[input]77^117 mod 100[/input]

[input]77^117[/input]

adminJul 13, 2012

Jul 12, 2012

+18

This question is dealing with a Composite Function.
(h(f(x)))
Be careful, when you have a composite function, one function is inside of the other. It is not the same as taking the product of those functions.

2-f(x)/f(x)

2- (2/x+1) / (2/x+1)

Top : Find lowest common denominator x+1
2(x+1)-2 /x+1 / 2/x+1
2x+2-2/x+1 / 2/x+1
2x/x+1 / 2/x+1
To divide fractions Multiple by its inverse.
2x/x+1 * x+1/2
x+1 cancels out
2 cancels out
Leaving us with x.
h(f(x)) = x

Hope this helps, good luck. - Ivy

Ivy OrchidJul 12, 2012

+18

Here is a link to a page that has equations for surface area and volume of many geometric shapes.
http://staff.argyll.epsb.ca/jreed/math8/strand3/3206.htm

This link is to an interactive surface area and volume page:

http://www.shodor.org/interactivate/activities/SurfaceAreaAndVolume/

If you have some numbers I can work with, I could show you better. Step by Step.

Good Luck - Ivy

Ivy OrchidJul 12, 2012

-3/4-1/2x

Find Lowest common denominator 4x

-3x-2 / 4x

-Ivy

GuestJul 12, 2012

Jul 11, 2012

+3146

[input]3x/(x^2)-1 = 2x^2+5x/ (2x^2)+7x+5 - 16x/(4x)[/input]

adminJul 11, 2012

Assuming that when she turns southwest, that she goes directly southwest at a 45degree angle.
Also that when she turns East she goes directly east making another 45 degree angle.

Total distance North 5.25km
Total Distance SW 2.75km
Total Distance E 3.79km

Y = distance north above the point where she crossed her own path going east.
N = 5.25-Y = distance north before paths crossed.
X = distance she traveled east before crossing her northern path
E = 3.79-X = distance after she passed her northern path.
Z = Distance from Starting Point to End Point.

This gives us our first right triangle
A = 90° a = 2.75km
B = 45° b = y
C = 45° c = x

SinB=Opposite/Hypotenuse
Sin45= X/2.75
X=1.94
SinC=Opposite/Hypotenuse
Sin45=Y/2.75
Y=1.94

Solve for N and E
N = 3.31
E = 1.85

From here there are a few ways we could find Z. I chose to use Pythagoras's theorem.
a^2+b^2=c^2
For my purposes a=N and b=E
(3.31^2)+(1.85^2)=Z^2
Z = 3.79km

She was 3.79km away from where she started.
Hope this helped, good luck.
- Ivy

GuestJul 11, 2012

Fred left town B for Town A at 0730h.Linda left town B for town C at the same time. At 1030h,they were 480 km apart.Both Fred and Linda reached their destination at the same time 1200h.

(a) Find the distance between town A and C
(b) If Linda's speed was 3/5 the speed of Fred, find Fred's speed

First Assuming Town A, B, & C are in a straight line to one another.
[if these towns were not in a straight line, we could then use trigonometry to determine these distances. Given that we had the bearings of each vehicle.]

(a) In 3hrs of traveling they net 480km. s=d/t Their total speed would be = 480km/3h=160km/h
There are two of them traveling so if they are traveling the same speed 160km/h / 2 people =80km/h per person average.

Assuming that they continue at this speed. The complete trip is 4.5h. Total distance between A and C is D=s*t 160*4.5 = D of 720 km.

(b) Total Speed = Fred's Speed + Linda Speed
3/5=60% or .6 Fred's speed = X
X + .6X = 160
1.6x = 160
x = 160/1.6 = 100
Fred's Speed 100km/h
Linda's speed 60km/h

If you now want to find distance A-B or B-C you can do that to check your math.
D=s*t
A-B=100*4.5=450km
B-C=60*4.5=270km
Total Distance 450km + 270km = 720 km.

Hope this helps, Good luck.
- Ivy

GuestJul 11, 2012

There is 4ml of grape to every 100ml of 20mg amoxicillin. The patient wants apple you ca add 1/5 the amount of apple as you can grape. How any milliliters of apple would you use to flavor 300ml of amoxicillin.

20% of 4ml is .8ml per 100ml of amoxicillin.
multiply by 300ml of amoxicillin = 2.4 ml of apple.

However, I am not very familiar with pharmacology and do not know the significance of "20mg amoxicillin" I am only familiar with solid mg dosing. Most liquid suspensions that I have found are showing high mg/5ml of medicine. So like 400mg/5ml. I don't know if having that knowledge would change my answer or not. Good luck.

GuestJul 11, 2012

When I typed to make it look more clear, it didn't save my spaces so it just looks weird there now
1/36b^6 * 9b^4/1

Just wanted to say I did put spaces in there, but they didn't stay. Sorry about that.

GuestJul 11, 2012

Given b^2(1/2b^-1)^2 (3b^3)^-2/(9b^4)-1

After looking over this question, I think it might write like this
b^2(1/2 b^-1)^2 (3b^3)^-2/(9b^4)^-1

In this problem we have a negative exponent to start with. That means we need to take the reciprocal of the base. Note that we DO NOT take the reciprocal of the exponent, only the base.

b^2 * (1/2b)^2 * (1/3b^3)^2 / (1/9b^4)
b^2 * (1/4b^2) * (1/9b^6) / (1/9b^4)
--- [remember when multiplying exponents to add them b^3 * b^3= b^6]
b^2/36b^8 / (1/9b^4)
simplify the numerator
1/36b^6 / ( 1/9b^4)
invert and multiply when dividing fractions.
1 9b^4
------ * ------
36b^6 1

[Typing it this way makes it easier to read, but can also be typed
1/36b^6 * 9b^4/1 ]
9b^4/36b^6
Simplify
1/4 b^2

Of course this is assuming that there is a typo in the expression.
Hope this helps, and good luck.

GuestJul 11, 2012

I'm asking for a typo check. Please double check your expression to make sure this is typed correctly, thank you.

GuestJul 11, 2012

Given cot = -7/4

cot Θ = 1/tan Θ
tan Θ^2+1 = sec Θ^2
1+cot Θ^2 = cosec Θ^2
cosec Θ = 1/sinΘ

-7/4 = 1/tan Θ
tan Θ = 4/7

(4/7)^2+1 = sec Θ^2
16/49+1 = sec Θ^2
16/49+49/49 = sec Θ^2
65/49 = sec Θ^2
sec Θ = √65/7

1+(-7/2)^2 = cosec Θ^2
16/16 + 49/16 = cosec Θ^2
65/16 = cosec Θ^2
cosec Θ = √65/16

√65/16 = 1/sin Θ
sin Θ = √16/65

If I did this right, those should be the answers. I'm a little rusty, but I hope this helps.
-Ivy

GuestJul 11, 2012

Please type out the questions.

The first is showing (log x-2) ( * or - ) log x = 3
What sign is it a multiply or a minus sign?

Second image shows 4^x*5^x+? I can't read what it is you have written. In the future please type out these questions, so that you might receive a more timely and accurate response.

http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/

Tutorial 42-46, might help you.

Good luck.

GuestJul 11, 2012

Jul 10, 2012

If they just want you to write everything under the cube root radical.

Then 4x4x4= 64 x 5 = 320 so ³√320

I hope this is what you are asking, good luck.
- Ivy

GuestJul 10, 2012

the munber of teaher hired fro the 3500 student should be same as the ratio of present condiion the ratio is given as
3000/90= 500/x
or x= (3000*500)/90
x=15
total no. of teacher will be 90 + 15 = 105
now cross check can do
90/3000 = 0.03
105/3500 = 0.03

GuestJul 10, 2012

Jul 8, 2012

+3146

[input]lcm( 9, lcm( 12 , 15) )[/input]

adminJul 8, 2012

+3146

[input]sqrt3(621)[/input]

adminJul 8, 2012

Jul 6, 2012

n = 4
p = 16/(16+38)
P(X>=1) = 1 - P (X<1) = 1 - P (X=0) = 1 - (16/(16+38))^4

GuestJul 6, 2012

If you mean (5x-3y)^2 = 25x^2 - 30xy + 9y^2

If you mean (5x-3y) * 2 = 10x - 6y

GuestJul 6, 2012

Use a T-table. Google it.
I believe Degrees of Freedom for a t test is n-1
So in your case df = 24 -1 =23
We know t = 1.717
So p-value ~ 0.05

GuestJul 6, 2012

Count.
Dimensions are the rows X columns.
For example
A 2X2 Matrix looks like:

a b
c d

Where a 3X2 Matrix looks like:

a b c
d e f

GuestJul 6, 2012

Jul 5, 2012

It's true, bro

GuestJul 5, 2012

Jul 4, 2012

+3146

Aufg.2:
3 unbekannte Variablen (Dora, Dorle, Dorit), also braucht man min. 3 Gleichungen:

Cyb3rPho3niX:
Dora und Dorle haben bereits zusammen ein biblisches Alter von 18 Jahren

Gleichung1: Dora + Dorle = 18

Cyb3rPho3niX:
Dora und Dorit haben zusammen ein Alter von 14 Jahren

Gleichung2: Dora + Dorit=14

Cyb3rPho3niX:
Dorit und Dorle von 16

Gleichung3: Dorit + Dorle= 16

[input]solve( Dora + Dorle = 18, Dora + Dorit=14, Dorit + Dorle= 16 )[/input]
Ergebnis: {Dora=8, Dorle=10, Dorit=6}

Cyb3rPho3niX:
„Nein, das ist so nicht richtig. Ich erhalte nur ….“

[input]8 * 10 * 6[/input]

Cyb3rPho3niX:
Welches Alter müssten die Kaninchen haben, damit Dina Recht hätte?

wenn: 1638=Dora * Dorle * Dorit
Ergebnis z.B.:
Dora=1638 Jahre
Dorle=1 Jahr
Dorit=1 Jahr
Test:[input]1638*1*1[/input]

adminJul 4, 2012

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