Science & Mathematics - 17 November 2007

Thanks!

2007-11-17 09:07:01 · 7 answers · asked by Anonymous in Mathematics

2007-11-17 09:06:38 · 8 answers · asked by Anonymous in Other - Science

Explain your answer.

2007-11-17 09:05:20 · 5 answers · asked by Helen B 5 in Mathematics

I already asked this question but miss-spelled the word previously..
I know that DNA contain chromosomes, but do they contain chromatin? (not chromatid)

2007-11-17 09:04:05 · 3 answers · asked by xxteresa 2 in Biology

1. Six pears and three apples cost $3.90. Two pears and five apples cost $3.30. How much does one pear cost? Hint: You have two unknowns (variables), so you need two equations. Write one equation for each situation and solve the system of equations.

Let p = the cost of one pear

Let a = the cost of one apple

a. Write a system of equations that can be used to determine the cost of pears and apples.

b. Determine the cost of one pear and one apple. Use mathematics to explain how you determined your answer.


2. There were 1500 people at a high school football game. Student tickets were $2.00 and adult tickets were $3.50. The total receipts for the game were $3825. How many students bought tickets?

Let a = the number of adult tickets purchased.

Let s = the number of student tickets purchased.

a. Write a system of equations that can be used to determine the number of adult and student tickets purchased.

b. Determine the number of adults tickets sold and the number of student tickets sold. Use mathematics to explain how you determined your answer.


3. An airplane flew 4 hours with a 25 mph tail wind. The return trip against the same wind took 5 hours. Find the speed of the airplane in still air. This similar to the current problem as you have to consider the 25 mph tailwind and headwind.
Let r = the rate or speed of the airplane in still air.

Let d = the distance

a. Write a system of equations for the airplane. One equation will be for the outbound trip with tailwind of 25 mph. The second equation will be for the return trip with headwind of 25 mph.

b. Solve the system of equations for the speed of the airplane in still air.


4. Your family likes to go to baseball games. At one game your family bought 5 soft drinks and 5 hot dogs for $22.25. At the next game your family attended they bought 4 soft drinks and 3 hot dogs for $14.50. What is the cost of one soft drink and one hot dog?

Let s = the cost of one soft drink

Let h = the cost of one hot dog

a. Write a system of equations modeling the situation described above.

b. Solve the system for the cost of one soft drink + one hot dog. (You will have to add your solutions together for this one.)


5. Suppose you just have just enough dimes and quarters to pay for a loaf of bread and quart of milk, which cost $3.45. You have a total of 15 dimes and quarters.

Let d = the number of dimes you have.

Let q = the number of quarters you have.

a. Write a system of equations that models the information given above.

b. Solve the system for the number of dimes and quarters you have. You may want to solve this by graphing.

2007-11-17 08:59:45 · 2 answers · asked by Ashley A 1 in Mathematics

$9000 has been invested in an account paying 7.87% annually, compounded monthly.

How long will it take for the investment to exceed 12031?

Your answer should be accurate to one decimal place.

Approximately ________years

2007-11-17 08:57:47 · 2 answers · asked by lauren m 1 in Mathematics

if both of you were found to carry a harmful recessive allele, how would you decide with this decision?

2007-11-17 08:57:45 · 4 answers · asked by Anonymous in Biology

At this moment, a bacteria colony has a volume of 9.3 cubic centimeters. The bacteria colony is growing continuously at a daily rate of 2.3%. At this rate, how long will it be before the bacteria colony outgrows the 46.5 cubic centimter container in which it is stored? Express your answer accurate to 1 decimal place.
_________ hours

2007-11-17 08:56:16 · 3 answers · asked by lauren m 1 in Mathematics

Two positive numbers are squared their sum is 11810. If the first number is 1 less than 2 times the second number, what is the smaller number.

2007-11-17 08:55:07 · 6 answers · asked by seed2ofchuck 2 in Mathematics

what kinds of bacteria are found in faucet water?

what about bottled water?

what about river/creek water?

basically, i need about 2 to 3 different variables of water and i need a resource telling what kind of bacteria are found in that water. i'll be doing a further research on these bacterias. thank you in advance.

2007-11-17 08:53:03 · 2 answers · asked by vaiogirl 3 in Biology

I'm going to be filming a video for a project in class, and my partners and I need a fog effect for the video. We're trying to keep it low budget so a fog machine is out of the question. We'll be filming really soon, so does anyone know if I can just store it in a cooler at room temperature? Also, we're buying about 2 pounds worth. Anyone know how to make the most of it?

PS The video is about 2 minutes long, but we're buying a little extra in case we have to do multiple takes

2007-11-17 08:52:50 · 4 answers · asked by agiel777 2 in Chemistry

Recall A =πr^2

2007-11-17 08:50:35 · 3 answers · asked by Alex111 1 in Mathematics

Evaluate the definite integral from 4 to 0.
{dx} / {2 x + 7}

2007-11-17 08:49:35 · 4 answers · asked by colin.muller 1 in Mathematics

Ok i am building a bridge for my science fair project. i am building a trsuss bridge but i dont know whats the name of the support on the top called. its like a roof plzz help

2007-11-17 08:45:57 · 4 answers · asked by Anonymous in Engineering

Evaluate the definite integral from 1 to 0

(e^{8 x} - 8 x)^{4} (e^{8 x} - 1) dx =

2007-11-17 08:40:15 · 4 answers · asked by colin.muller 1 in Mathematics

2007-11-17 08:39:28 · 6 answers · asked by Anonymous in Zoology

also do you know which layer of the atmosphere does most of the weather take place and why??? i would really appreciate someone answering this question. thanx!!!

2007-11-17 08:37:40 · 2 answers · asked by Anonymous in Weather

Also,
which of the following sets are open and/or closed?

{z: (Re(z))^2 - (Im(z))2 less than or equal to 1}

{z: -Pi/4 < arg z < Pi/4}

Thanks

2007-11-17 08:37:31 · 4 answers · asked by Dan 1 in Mathematics

It covers 4 chapters plus it is a bout 6 pages long

2007-11-17 08:36:31 · 4 answers · asked by Wendy G 2 in Mathematics

1. What is the wavelength of a 19F+ ion which is moving with a speed of 4.255x10^5 m/s?

I come up with 8.2001x10^-41m but the choices available are:
4.936x10^-20m
4.936x10^-17m
4.936x10^-14m
1.484x10^-29m
1.484x10^-26m

2007-11-17 08:35:33 · 1 answers · asked by S281 2 in Chemistry

2007-11-17 08:34:15 · 7 answers · asked by Anonymous in Mathematics

I've tried everything, but I am so confused. Please, can someone explain the process in simple terms?

2007-11-17 08:33:50 · 3 answers · asked by luvkomal04 1 in Mathematics

Please show steps. Thanks :)

2007-11-17 08:33:00 · 4 answers · asked by Brunette Cutie 1 in Mathematics

Copper metal was just dipped into acid, it was not heated or anything. can someone give me a easy explanation? thanks

2007-11-17 08:32:18 · 4 answers · asked by purplelightning92 4 in Chemistry

Please show steps. THANKS

2007-11-17 08:31:51 · 2 answers · asked by Brunette Cutie 1 in Mathematics

what is the weather like?

who are you with?

2007-11-17 08:30:50 · 38 answers · asked by Anonymous in Geography

What was the doctors name that operated on New Englands Patriots player Teddy Bruschi and where was the operation performed? The operation was on the heart.

2007-11-17 08:26:57 · 1 answers · asked by spacedoorgo 1 in Medicine

2007-11-17 08:24:30 · 9 answers · asked by Anonymous in Geography

What are the known isotopes of potassium, and what is the most abundant?

2007-11-17 08:23:31 · 2 answers · asked by primaballerina30058 1 in Chemistry

A buffer containing 1.0564 M of acid, HA, and 0.1416 M of its conjugate base, A-, has a pH of 3.30. What is the pH after 0.0017 mol NaOH is added to 0.5000 L of this solution?

2007-11-17 08:23:17 · 1 answers · asked by Ecka 1 in Chemistry