Mathematics - 14 August 2007

2007-08-14 22:33:41 · 5 answers · asked by NERDface 1

Use the rules of differentiation to find the derivatives of the following function. Simplify terms wherever possible, but it is not necessary to factorise and then cancel any of the expressions.

2007-08-14 22:29:01 · 2 answers · asked by Anonymous

How do you get the domain and range of the graph by just looking at the graph plainly?


Please help. My mathematics periodical exam is tomorrow.

2007-08-14 22:11:52 · 8 answers · asked by Anonymous

f(x) = 1 / (2x+3)

2007-08-14 22:08:19 · 3 answers · asked by Anonymous

A honeybee flies from its hive to a flower 100m away. Then, it returns to the hive and flies to another flower half the distance of the first one. If it keeps flying back and forth to different flowers which are always half the distance of the one before, how far will it have travelled if the last flower is 12.5m away from the hive ?

2007-08-14 21:22:11 · 8 answers · asked by edwardmong 1

2007-08-14 21:13:39 · 2 answers · asked by Irwan 2

What is the formula for percetage increase? For example I'm trying to calulate the origional number. Number is $108.90, it increase 8.9%, how do I get back to the origonal number which is $100? What is this formula.

Or once again. Number is $136.13, increase 8.9% how do I get back to $125?

How do I know going backwards what the old number was after increasing 8.9%

Thanks!

2007-08-14 20:02:46 · 6 answers · asked by Bill 3

sqrt(20)+sqrt(80)-sqrt(125)

thanks!

2007-08-14 19:45:43 · 4 answers · asked by sexycheerleader2009 3

Please help me find the proof on this matrix equivalence theorem.

Two mxn matrices A and B are equivalent if and only if B=PAQ for some nonsingular matrices P and Q.

2007-08-14 19:43:22 · 3 answers · asked by zp33 1

y = (2x+3)^3 / root4x-7

the root4x-7 = (4x-7)^1/2 i just didnt know how to write it haha

i know you use quotiant rule and chain rule. I get up to this:
= [3(2x+3)^2 (4x-7)^1/2 - 1/2(4x-7)^-1/2 (2x+3)^3 / 4x-7 ] 8
am i on the right track ?
haha thanks =)

2007-08-14 18:50:41 · 3 answers · asked by Henry Chan 1

Maxine & Sammy have the same amount of lawn.

maxine can mow the lawn in 24 min.
sammy can mow the lawn in 36 min.

At what time will sammy have twice as much lawn to mow as maxine?

2007-08-14 18:36:48 · 6 answers · asked by thee.mighty.m 1

For i = , if 3i (2 + 5i) = x + 6i, then x = ?
A. –15
B. 5
C. 5i
D. 15i
E. 27i

the answer is a

2007-08-14 18:36:05 · 6 answers · asked by Anonymous

Barry can do a certain job in 5 hrs. Whereas If mike helps him, it takes them 4 hrs to do the job working together. How long would it take mike to complete the job by him self?

Please explain the concept behind this problem? What is a good way to approach problems like this?

2007-08-14 18:30:31 · 4 answers · asked by Anonymous

The number of bacteria in a culture is given by the formula:
N=N[low 0] e^kt
where t is time in hours.

In a certain culture, the bacteria increased from 2000 to 7000 in 6 hours. What is the percentage rate of increase?

2007-08-14 18:12:11 · 2 answers · asked by th3one101 2

THANK YOU SO MUCH.

2007-08-14 17:56:37 · 4 answers · asked by sweetcalm<3 3

solve the equation... show work please!!
thanks

x+1 -2sqrt(x+11)=0

2007-08-14 17:42:46 · 4 answers · asked by sexycheerleader2009 3

on 8y+20=y+2y-5y (i got y=20) on 4b-10=b+3b-2b(i got b=5) on -7f+2f=-36+f+3f(i got f=-9) on -5a+7a=-18+3a+5a(i got a=-3) on 9y+2=3(y+4) (i got 14/6 but stuck)

2007-08-14 17:28:22 · 3 answers · asked by dularu s 1

a) compute dy/dx
I got (16x-5y)/(5x + y^2)

b)write an equation for the line tangent to the curve at the point (4,-1)
I plugged the numbers in the derivative and then got (y+1)=3(x - 4)

c)there is a number k so that the point (4.2,k) is on the curve. Using the tangent line found in part b, approximate value of k ..
so I dont know if this is right but I just plugged those numbers..
k+1=3(4.2 - 4) and got k= -0.4

d)write an equation that can be solved to find k so that the point (4.2, k) is on the curve..
What do I do for this one?

e) Solve the equation found in d for the value of k.

Can someone help me?
Thanks!

2007-08-14 17:27:13 · 2 answers · asked by Anonymous

on 4-9ju=j+4 (I got j=1 )on 6n-4n+20 (i got n=2)on 11e=9e+14 (i got e=7) on 5d-4=2d+6(i got it wrong) on 2j-5=8j+7(i got wrong also) these are hard for me to explain to my son.

2007-08-14 17:15:33 · 10 answers · asked by dularu s 1

2007-08-14 17:09:08 · 8 answers · asked by tonya t 1

we got a worksheet--i need help. they give you all the connecting words and the first letter of each other word, but nothing else except underscores to tell you how many letters are in the word. Ok,
3 P_ _ _ _ into which A_ _ _ _ _ _ G_ _ _ was D_ _ _ _ _ _
and
10 P_ _ _ on a B_ _ _ _ _ _ L_ _ _
and
77 S_ _ _ _ _ S_ _ _ _

2007-08-14 16:52:48 · 6 answers · asked by Anonymous

Forinstance, integral

x dx
------------
(7x^2+3)^5 ?????

2007-08-14 16:50:25 · 2 answers · asked by Maria S 2

7(2d-1)+5(2-3d)=2d

2007-08-14 16:09:50 · 10 answers · asked by jennifer m 2

I am trying to help explain to my kid and i'm not sure myself.

2007-08-14 15:58:40 · 8 answers · asked by jennifer m 2

2007-08-14 15:55:28 · 9 answers · asked by boltfan 1

the parallel sides of the isosceles trapezoid shown are 10 ft long and 16 ft long, respectively. what is the distance between these two sides in feet?

(other sides are 5 ft)

2007-08-14 15:23:57 · 3 answers · asked by Anonymous

the midpoint of AB is (4, -3) and A is located at (1, -5). if (x,y)are the coordinates of B, what is the value of x+y

2007-08-14 15:21:54 · 2 answers · asked by Anonymous

Find ∫[high π/2, low 0] cosx e^sinx dx

2007-08-14 15:08:45 · 1 answers · asked by th3one101 2

A how and why would be nice. Also the answer is not 1/5.

2007-08-14 15:03:30 · 4 answers · asked by Borat 1

2007-08-14 14:55:39 · 13 answers · asked by Anonymous