Mathematics - 1 July 2007

What bearing and airspeed are required for a plane to fly 400 miles due north in 2.5 hours if the wind is blowing from a direction of 328 degrees at 11 mph?
(answer: 358 degrees; 170 mph) Show Calculations!

2007-07-01 13:23:01 · 3 answers · asked by daniel 1

problem:
6x^2(x+4)^ 1/2 + 2x^3 (1/2 (x+4)^ -1/2 ..this was a deriv problem but i got to this far and dont know what to do next

2007-07-01 13:17:00 · 5 answers · asked by sdt3 1

2007-07-01 13:11:15 · 6 answers · asked by maya 1

2007-07-01 13:10:07 · 6 answers · asked by Anonymous

In an undisclosed Mediterranean country trains run in a frequency of 2 per hour. In a customer survey, the passengers complained that average waiting time to a train is too long for a randomly arriving passenger. The management added a third train.
In view of the above arguments, related to self-weighted averages, can you describe circumstances under which an addition of a third train will INCREASE the average waiting time of a passenger that arrives randomly at the train station.

2007-07-01 13:04:49 · 3 answers · asked by tommytech 1

Use the arithmetic sequence of numbers 2,4,6,8,10... to find the following: What is d , the difference between any two consecutive terms?

Thank you

2007-07-01 12:57:58 · 2 answers · asked by quepid622 1

and what would be it's pH

2007-07-01 12:46:30 · 1 answers · asked by Anonymous

a 100kg bag of potatos has the amount of water inside it 99% after one day its 50kg but with 98 % water what is the sloution

2007-07-01 12:28:12 · 1 answers · asked by redo 1

I need help with this Gmat problem. Kaplan has explained it in their website but I dont get their explanation. Any help would be appreciated.

If X and Y are positive and X>Y, is X-Y² ?

1. √X-Y = Y
2. X>1/2 Y

2007-07-01 12:26:49 · 1 answers · asked by Faryal c 2

Solve the following exponential equeation. Express the solution in set in terms of natural logarithms.

e^4x + 2e^2x - 8 =0

2007-07-01 12:25:58 · 4 answers · asked by Anonymous

God math is sooo hard u guys and I am on my last 2 problems.. it says to

Divide using long division.

25 x^3+40x^2+21x+15 divided by -5x -4


Given functions f and g, determine the domain of f + g.

f(x) = 2x - 9, g(x) = 5 over x+8

thanks so much for your help!!

2007-07-01 12:23:58 · 2 answers · asked by JANICE 1

i like it but my dad encourages me to be an engineer like my phd brother but i dont see why i cant do math ....ilike it but have not partespated in any competations and am very active in class and the same in physics .my dad said i would not go anywhere with out a phd ...what do u think .....this is my first time saying this ...i think math is a booming field and has many oppertunaties .i hope to speacialize in applied mathmatics-parallel universes and quantume mechanics

2007-07-01 12:19:41 · 7 answers · asked by redo 1

2007-07-01 12:11:42 · 7 answers · asked by Anonymous

2007-07-01 11:59:02 · 3 answers · asked by Anonymous

2007-07-01 11:56:16 · 17 answers · asked by Anonymous

2007-07-01 11:25:45 · 5 answers · asked by heppy1712 1

Two hikers are 8.2 miles apart and begin walking toward each other, and finally meet in 2 hours. One of them walked 0.5 miles per hour faster than the other. How fast did each of them walk?

2007-07-01 10:39:41 · 5 answers · asked by Anonymous

i know its a basic question but i dont know my centimeters and stuff that well

2007-07-01 10:32:39 · 13 answers · asked by Anonymous

2007-07-01 10:32:06 · 14 answers · asked by Dawn M 1

itz supposed 2 say if m angle 1 = 50 degrees then m<5= ? i know the answer is 50degrees Corresponding Angles Postulate..but i dont know how 2 get he answer. I need to know the steps..

2007-07-01 10:21:34 · 2 answers · asked by brittany f 1

2007-07-01 10:18:17 · 7 answers · asked by Anonymous

Ok I just wanted to double check my answer.
The problem is 3 square roots of 25...but since 25 is a perfect square do I add 5 (square root of 25) to 3 or do I multiply it by the 3? Because I multiplied it and got an answer of 15 but I wanted to ask you guys. Thanks

2007-07-01 10:04:12 · 6 answers · asked by ellyceqt 1

2007-07-01 09:57:23 · 7 answers · asked by randall_gilmore 1

2007-07-01 09:48:27 · 15 answers · asked by randall_gilmore 1

I use Visual calculus (a website, google it) to practice my calculus. However, I stumbled upon this problem, and I think the website is wrong, I need a second opinion! The integral is as follows: 2e^x - 5 cos (x) dx, from [0, pi]. The websites answer is: 2e^pi - 2, however, I get 2e^pi - 7... This is the website, problem #5, thanks! http://archives.math.utk.edu/visual.calculus/4/ftc.10/index.html

2007-07-01 09:46:04 · 4 answers · asked by Jorm 3

and what is 3 and one third divided by 5 over 6

2007-07-01 09:08:46 · 17 answers · asked by Top_Gear_Biggest_Fan 5

After watching a 50 year old woman stuggle with this I wanted to see how many people could get it right.

2007-07-01 08:16:32 · 13 answers · asked by Nicole L 2

A family drove to a location at 55 miles per hour and returned on the same road going 35mph. The total driving time was 3.6 hours. What is the distance of the location in miles?

2007-07-01 07:55:01 · 2 answers · asked by Anonymous

CAN SOMEONE PLEASE SHOW ME HOW TO DO THESE PROBLEMS... I HAVE THE ANSWER BUT HAVE NO IDEA HOW TO SOLVE THEM....

THANKS :)






17. A 13-foot ladder is leaning against a vertical wall. If the
bottom of the ladder is being pulled away from the wall
at the rate of 2 feet per second, how fast is the area of
the triangle formed by the wall, the ground, and the ladder
changing at the instant the bottom of the ladder is 12 feet
from the wall?



ANSWER: -119/5 feet squared per second




19. A tank contains 1000 cubic feet of natural gas at a pressure of 5 pounds per square inch. Find the rate of change
of the volume if the pressure decreases at a rate of 0.05
pounds per square inch per hour. (Assume Boyle’s law:
pressure × volume = constant.)

ANSWER: 10 feet cubed per hour

2007-07-01 07:34:01 · 4 answers · asked by Anonymous

don't understand how to derive this.

2007-07-01 07:24:42 · 3 answers · asked by Lanksta 1