Science & Mathematics - 22 November 2006

Q:7) A rail journey of 300 km cost £84. At the same rate per km
a)what would be the cost of traveling 250 km.
b)How far could you travel for £63?

Q:8) Do this question on a sheet of graph paper. Do not shade the defined by the inequalities.
x+y < 6, 3x+y ≥ 3, y ≥ -1

Q:9) Find, an expression for the nth term

i)5,10,15,20,………...
ii)1,8,27,64, …………
iii)2,4,7,11,16……..

Q:10) Factorize
a)x2 – 7x
b)x2 + 12x + 20
c)x2 – 4
d) 552 - 452
e) Find the value of p and q, for all values of x.
x2– px + 12 = (x – 6)(x-q)

Q: 11) When three times a number, x, is added to a second number, y, the total is 33. The
first number added to three times the second number is 19.
a)Form two equations connecting x and y.
b)Find the two numbers.

Q:11) Ahmed is x years old and his father is x2 years old. The sum of their ages is 56
years. Form an equation in x and solve it to find the age of each.

2006-11-22 22:03:02 · 4 answers · asked by Anonymous in Mathematics

I didn't even get the problems! is there anyone who can answer and explain?

A field of flowers is surveyed and found to contain 700 purple flowers and 300 white flowers.

1. Knowing that purple is dominant to white, what is the frequency of the white allele in the population?
A. 0.7
B. 0.3
C. 0.55
D. 0.09

2. What proportion of the population is heterozygous?
A. 0.21
B. 0.021
C. 0.049
D. 0.5

3. How many Purple alleles are in the population?
A. 700
B. 550
C. 500
D. 450
Pheylketonuria (PKU) is the inability to process the amino acid pheynylalanine. Mental retardation can result if left untreated. PKU is caused by a recessive allele. In the US every year, 1 out of every 10,000 babies are born with the condition.

4. What is frequency of the PKU allele (q) in the population?
A.0.0001
B.0.001
C.0.01
D.0.005

5. What is the frequency of heterozygotes in the population?
A.0.0198
B.0.002
C.0.198
D.0.05

2006-11-22 21:49:19 · 3 answers · asked by javalearner 1 in Biology

http://foto.mail.ru/mail/dalm2000/532/

2006-11-22 21:46:13 · 6 answers · asked by Alex N 3 in Astronomy & Space

1.if y = x^(x+2), what is dy/dx?

2. if y= (x+5)^x, what is dy/dx.

3. if y = 3.14^x, what is dy/dx.

thank a lot for sharing ur time for my questions. i really wanna kno the answers exactly.

2006-11-22 21:44:53 · 3 answers · asked by free aung san su kyi forthwith 2 in Mathematics

2006-11-22 21:38:16 · 3 answers · asked by Anonymous in Zoology

2006-11-22 21:31:33 · 10 answers · asked by paulinem_pink 2 in Physics

2006-11-22 21:21:07 · 2 answers · asked by ivy l 1 in Mathematics

I'm suppose to factorise this equation: x^2 - 6x - 3 (for homework).. I've worked on it and the only solution i can get is:

(x-3)^2-6 = x^2-6x-3

checked: (x-3)(x-3) -6
x^2 -3x-3x+9-6
Therefore = x^2 - 6x + 3

Is this ok and also, is there any other method of doing this?? Suggestion welcome...

Thanks and Happy Thanksgiving :-D

2006-11-22 21:20:10 · 7 answers · asked by Princess Of Persia 2 in Mathematics

This is about lipids and its properties. Thanks! :)

2006-11-22 21:13:40 · 3 answers · asked by MiG 1 in Chemistry

2006-11-22 21:13:04 · 17 answers · asked by angel 4 in Biology

Labatory conditions; Apparatus, A peice of cord about 2m in length, a fixed pivot point,a symetrical pendulum bob, a measure tape and stop watch. measure the cord ar 5 different lengths and swing pendulum through a small arc of 10 degrees for 10 oscillations, repeat twice for average time and plot findings. CONLUSION this is the bit i need help with! outline the reasons why this method only gives an approximate value, no matter how ACCURATELY the experiment is performed.

2006-11-22 21:08:43 · 9 answers · asked by Anonymous in Physics

2006-11-22 21:06:10 · 6 answers · asked by priyan 1 in Chemistry

2006-11-22 21:00:17 · 5 answers · asked by jo jo 2 in Chemistry

were was an earthquake in this morning?

2006-11-22 20:55:34 · 4 answers · asked by Nechita M 1 in Earth Sciences & Geology

2006-11-22 20:51:55 · 6 answers · asked by nxt dOOr galz 1 in Earth Sciences & Geology

2006-11-22 20:38:10 · 15 answers · asked by Anonymous in Geography

2006-11-22 20:30:01 · 7 answers · asked by boy boy 7 in Engineering

2006-11-22 20:27:20 · 3 answers · asked by Anonymous in Medicine

What is Charles Darwin's theory of natural selection and evolution!?

Why are there so many different species today? For example, why is a crow more alike to a magpie, than it is to a Bush stone curlew? Did it have a different common ancestor to the Bush Stone Curlew? Answer either/both please...

2006-11-22 20:24:38 · 7 answers · asked by Nass 1 in Biology

How was oxygen created from the big bang?

And what does the oxygen do to the living creatures?

Why the oxygen is important element to the living creatures?

2006-11-22 20:19:43 · 4 answers · asked by davegesprek 1 in Other - Science

How was oxygen created from the big bang?

And what does the oxygen do to the living creatures?

Why the oxygen is important element to the living creatures?

2006-11-22 20:18:27 · 3 answers · asked by davegesprek 1 in Biology

(A)By adding heat to Earths surface,(B)By adding gases to the atmosphere,(C)By adding lava to Earths surface,(D)By adding water vapour to the atmosphere,(E)None of the above.Please help me I don't know the answer.

2006-11-22 20:15:34 · 4 answers · asked by Anonymous in Earth Sciences & Geology

It has long been claimed that humans share 98.5% of their DNA with chimpanzees, though that estimate has more recently been reduced to about 95%.

http://www.newscientist.com/article.ns?id=dn2833

Yet in a story today, scientists claim that 12% of the human genme can vary from one person to another.

http://news.bbc.co.uk/1/hi/sci/tech/6174510.stm

So if one human is 95% similar to a chimp, yet only 88% similar to another human, are they more ape than man?

And if so, could they be Robbie Williams?

2006-11-22 20:12:12 · 7 answers · asked by gvih2g2 5 in Zoology

2006-11-22 20:09:59 · 4 answers · asked by Anonymous in Chemistry

Factorise this: 4-8x+20x^2

my tutor says this isn't possible.. I factorised it and my tutor says that my answer is wrong, even though i checked it 15 times....

Try it and see if it is possible to factorise it..

2006-11-22 20:07:49 · 15 answers · asked by Princess Of Persia 2 in Mathematics

please give details of process..

2006-11-22 20:06:01 · 5 answers · asked by Warren 2 in Engineering

2006-11-22 20:00:41 · 6 answers · asked by Anonymous in Chemistry

2006-11-22 19:57:19 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2006-11-22 19:56:13 · 11 answers · asked by Anonymous in Earth Sciences & Geology

Just looking at the rain belt area via satellite imagary it looks dry as a bone, but similar latitudes across Asia have had severe flooding this year as opposed to last year which was totally dry. Meteorologists' comments welcome.

2006-11-22 19:52:42 · 2 answers · asked by VIP 4 in Weather