Mathematics - 1 August 2007

On a 570 mile trip, Andy averaged 5 miles per hour faster for the last 240
miles than he did for the first 330 miles. The entire trip took 10 hours. How
fast did Andy travel for the first 330 miles?

2007-08-01 17:33:03 · 2 answers · asked by Tazzzy 1

Two airplanes leave New York at the same time and fly in opposite directions,
if one travels at 500 miles per hour and the other at 550 miles per
hour, how long will it take for them to be 4200 miles apart?

2007-08-01 17:32:13 · 7 answers · asked by Tazzzy 1

Eva invested a certain amount of money at 10% interest and $1000 more
than that amount at 11%. Her total yearly interest was $740. How much
did she invest at each rate?

2007-08-01 17:31:44 · 4 answers · asked by Tazzzy 1

Suppose that you have a supply of a 15% solution of alcohol and a 45%
solution of alcohol. How many quart of each should be mixed to produce 30
quarts that is 25% alcohol?

2007-08-01 17:25:01 · 2 answers · asked by Tazzzy 1

Barry can do a certain job in 4 hours, whereas it takes Mike 6 hours to do
the same job. How long would it take them to do the job working together?

2007-08-01 17:24:31 · 7 answers · asked by Tazzzy 1

How do you find the solution to this initial value problem? y'' + 2y' + 5y = 4e^(-t)*cos(2t) where y(0) = 1, and y'(0) = 0. Thanks a lot. The answer by the way is y = e^(-t)*cos(2t) + (1/2)*e^(-t)*sin(2t) + t*e^(-t)*sin(2t).

2007-08-01 17:09:53 · 2 answers · asked by Charlie4590 2

How to you find the general solution to this equation? y'' + y = 3sin(2t) + tcos(2t). Thanks a lot. The answer by the way is y = (c1)cos(t) + (c2)sin(t) - 1/3*t*cos(2t) - (5/9)sin(2t).

2007-08-01 17:04:44 · 1 answers · asked by Charlie4590 2

How do you find the general solution of this equation? y'' + 2y' + y = 2e^t. The answer is y = (c1)e^(-t) + (c2)te^(-t) + t^2*e^(-t). Thanks.

2007-08-01 17:02:17 · 2 answers · asked by Charlie4590 2

2007-08-01 16:27:37 · 1 answers · asked by maya 1

How do i find e on the calc? to figure out 1030e^0.056

2007-08-01 16:15:25 · 7 answers · asked by dnbozo 1

What will it cost to cover a rectangular floor that measures 40 by 50 feet with square tiles that measure 2 feet on each side if a package of 10 tiles costs $13 per package?

be sure to work out

2007-08-01 16:14:21 · 5 answers · asked by Anonymous

1. x+13=7 5/8+9 3/8

please help and explain thanksss

2007-08-01 16:05:23 · 8 answers · asked by lasfklaf; 1

A frog fell into a hole that was 14 1/2 feet deep. He could jump 3 feet, but he slid back a foot each time he jumped. How many jumps does it take him to get out of the hole?

2007-08-01 15:55:09 · 16 answers · asked by ۞_ʞɾ_۝ 6

Hi there, I have a question to answer which reads

"By factoring the differential operator, or otherwise, obtain the general solution of the following equation:

u_xx + u_xy - 2u_yy + 3u_x + 2u_y + 2u = 0", where u_xx means the second deriv of u with respect to x, or d^2u/dx^2 etc.

Can anyone explain how I go about factoring this? I've tried pretending the diff operator is a polynomial but I can't factor it at all. I'm assuming that since the question suggests factoring that it is actually possible.

Thanks,

2007-08-01 15:55:01 · 1 answers · asked by Anonymous

 1
11
21
1211
111221
312211
13112221

2007-08-01 15:45:30 · 5 answers · asked by ۞_ʞɾ_۝ 6

2007-08-01 14:41:41 · 4 answers · asked by SadToday22 3

6x+1= (2x-1)(m+3)


multiple choice:

A) x= m+2 over 2m B) x= m+4 over 12+2m

C) x= 4-m over 2m D) x= m+4 over 2m


The multiple choice answers above are fractions. I will ONLY choose best answer for someone who shows all work and gets an answer above, thanks so much!

2007-08-01 14:30:35 · 3 answers · asked by fritzoschitzo 2

Prove the following formula:

Sin(pie/2 + Beta ) = cos beta


thank you

2007-08-01 14:25:03 · 4 answers · asked by Anonymous

Can you show me the right wat it is done.

using binomial theorem: (x+8)^3

i did:

x^3+x^2(8)+x(8)^2+(8)^3... then im stuck finding how to get the number before each term

2007-08-01 14:21:21 · 5 answers · asked by carpediemxrs 1

in a triangle, one of the sides measures the third part of its perimeter, the second side plus 3 equals half of the perimeter, the third side measures 8, what is the perimeter??

2007-08-01 14:19:33 · 7 answers · asked by monica 2

2007-08-01 14:14:29 · 5 answers · asked by Jacesmom 2

- (7z-6t) / (9z) + (z-6t) / (6z) +2


Express as a single fraction in lowest terms

2007-08-01 14:11:07 · 3 answers · asked by Anonymous

The area of the rectangle is 2(3x-2)/x-1. Find the width.?
The Length is 3x-2/x-2

2007-08-01 14:09:27 · 5 answers · asked by Anonymous

2007-08-01 14:02:10 · 2 answers · asked by Anonymous

Express as a single fraction in lowest terms

(3t-y) / (3t) - (7t+6y) / (7t) +1

2007-08-01 13:31:20 · 4 answers · asked by Anonymous

A curve is traced by a point P(x,y) which moves such that its distance from the point A(-1,1) is three times its distance from the point B(2,-1). Determine the equation of the curve.

2007-08-01 13:21:13 · 2 answers · asked by val 2

A. 681
B. 1092
C. 1362
D. 3276

2007-08-01 12:53:50 · 2 answers · asked by Dinesh P 1

The side of a square measures 10 cm. What is the area?

20 square centimeters

40 square centimeters

50 square centimeters

100 square centimeters

2007-08-01 12:51:38 · 3 answers · asked by zerokun4 1

Susan left her home at 7 AM, driving her car at the rate of 45 mph. At 9 AM her sister Marion drove after her along the same highway, traveling at the rate of 60 mph. In how many hours will Marion pass Susan?

2007-08-01 11:40:04 · 8 answers · asked by Marriot_Plum23 1

x^2=20

x^2+3x+12

2x^2+4x-3=0

2007-08-01 11:14:38 · 3 answers · asked by Anonymous