Mathematics - 29 November 2007

Determine whether the functions
a) f(x) = 3x - 1
b) f(x) = x^3 - x
are one to one and onto over the integers, the rationals, and the real numbers.

2007-11-29 04:50:10 · 1 answers · asked by MRG skier 1

X(3), or X to the third power.
Is it one to one function?
According to the mean value theorem, there exist derivate (f(0))= 0. For this reason, there exist value f(a)=f(b).
is it one to one function?

2007-11-29 04:49:12 · 1 answers · asked by ilsup y 1

The first question is quadratic equations and functions, and the second question is parabolas. Please can someone help me, I've been at these two problems for over an hour and I still cannot figure them out. THANK YOU!!!

2007-11-29 04:47:30 · 6 answers · asked by Anonymous

Manipulate the following for h

v = (3.14)r^2 h

this is basically what is the formula for height of a cylinder.

2007-11-29 04:41:55 · 5 answers · asked by Anonymous

Can anyone explain how i can find the lengths of 2 Lines.

There is a line with A at one side, M is the middle value, And C is on the other end of the line.

The co-ordinates
A is (1,1),
M is (2,3)
C is (3,5)

I need to find the lengths of the line MC and also MB

2007-11-29 04:40:41 · 6 answers · asked by Anonymous

How can i in prove my vocabalry and speling quickly?
Give as detail as possible.

2007-11-29 04:36:50 · 4 answers · asked by Zoey H 3

Take A, B and C and find me the Sum, what is it? Now take that, divide it by 16 and subtract 4, what's the final answer?

2007-11-29 04:33:45 · 3 answers · asked by ton d 2

2007-11-29 04:27:55 · 10 answers · asked by elite 3

a rectangular table top has an area of 60 sq feet if the length of the table is one foot less than 4 times the width, find its dementions

2007-11-29 04:22:58 · 8 answers · asked by sport 2

The following problems are to be written up in polished form, showing all relevant work.

2. A manufacturer purchases a key component used in the production of their product from two different suppliers. (They want to keep their flexibility by maintaining a relationship with both suppliers.) The cost for this key component from supplier A is $5.25 per unit. From supplier B, the component cost is $4.80 per unit. The manufacturer needs to 7500 units and has $37,350 available to make the purchases. Set up a system of equations to describe this situation. Solve the system of eqautions to find the solution.
3. On a sunny day, a building and its shadow form the sides of a right triangle. If the hypotenuse is 32 m long and the shadow is 24 m, how tall is the building?
4. An airplane leaves an airport and flies due west 120 miles and then 210 miles in the direction 220°30′. Assuming the earth is flat, how far is the plan from the airport at this time (to the nearest mile)? (Hint: draw a picture of this with north pointing up.)

2007-11-29 04:06:30 · 2 answers · asked by Nicole 4

if the lengths of the sides of the triangle are integers, what is the shortest possible length of a side?

2007-11-29 04:01:54 · 4 answers · asked by Anonymous

I'm really confused
A 48 inch piece of string is cut into 2 pieces. One piece is used to form a circle, while the other is used to form a equilateral triangle. How should the string be cut so that the sum of the area is a minimum.
Thanks for any help, I tried working it out for like an hour and can't get it right :S

2007-11-29 03:47:40 · 5 answers · asked by *SnowQueen* 3

2007-11-29 03:45:03 · 7 answers · asked by x j 1

how are you supposed to find the answer?

2007-11-29 03:42:45 · 9 answers · asked by jen 2

2007-11-29 03:37:59 · 5 answers · asked by FURIOUS 1

Given: C is on the perpendicular bisector of AB.
Prove: Triangle ADC=Triangle BDC

???

2007-11-29 03:28:48 · 2 answers · asked by heather 2

A storage bin is 12 ft long, 5 ft wide, and 3 ft high. What is its volume in cubic feet?

2007-11-29 03:28:18 · 5 answers · asked by FURIOUS 1

Not sure how to do either of these..I'd like to see the steps please so I can understand them

If Superman exerts 1000 pounds of force to prevent a 5000 lb boulder from rolling down a hill and crushing a bus full of children, then what is the angle of inclinaton of the hill?

A plane is headed due east with an air speed of 240 mph. The wind is from the north at 30 mph. Find the bearing for the course and the ground speed of the plane.

2007-11-29 03:25:17 · 1 answers · asked by Nicky 2

is y=4x to the 4th power a parobala or just a curved line? or neither? Please answer quickly thank you in advance!

2007-11-29 03:19:06 · 3 answers · asked by Anonymous

I am finishing up trig in college and I'm about to sign up for the next semester. Is it safe to skip precal and go straight to calculus?

I am not a math whiz, but I'm not totally lost either.

2007-11-29 03:12:11 · 7 answers · asked by PinkQuestions 1

2007-11-29 03:12:10 · 3 answers · asked by cmerritt32 2

why is 4 times 4 16
and why is - 4 times -4 16

2007-11-29 03:09:03 · 27 answers · asked by Bumumble 3

i was given this problem:

1/4 = 3 - ((2x-1)/(x+2)) and solve for x:
i get x = -8.666 but it doesnt check out right when i plug it back into the original equation for x.
can someone tell me what x is?
and show me how they came to that answer?

2007-11-29 03:08:40 · 5 answers · asked by G1B 2

the question is -2 to the 0 power -3 to the 0 power (-2 - 5 to the 0 power) - 1/-2 to the -2 power + x to the 2 power * y - xy if x = -2 and y = 3

I don't get it the 0 powers are messing me up.

2007-11-29 03:07:04 · 1 answers · asked by Anonymous

2. Determine the slope of the line that passes between the two points you’ve selected. (Hint: To set up points, let January of 05 be month 1, February of 05 month 2, and so on.) (3 points)
3. Substitute the coordinates of one point and the slope you calculated in step two into the point-slope equation of a line: y – y1 = m(x – x1).
Solve for y to get the form: y = mx + b. (3 points)
4. Clearly state what your variables represent. (Note: the collaborative investigation on page 459 might be helpful to develop a linear model.) (3 points)
5. Use your model, the equation you’ve developed, to predict the CPI for the next month. (3 points)
Consumer Prices Index
Food in Spain
Base 2006=100
Beginning January 2005
Source:INE Instituto Nacional de Estadística (España)
Copyright INE 2007


Month Food Index
Jan-05 94.934
Feb-05 94.778
Mar-05 95.123
Apr-05 95.805
May-05 95.874
Jun-05 95.895
Jul-05 95.641
Aug-05 95.979
Sep-05 96.188
Oct-05 96.408
Nov-05 97.012
Dec-05 98.296
Jan-06 99.227
Feb-06 98.911
Mar-06 98.926
Apr-06 99.144
May-06 99.341
Jun-06 99.892
Jul-06 100.309
Aug-06 100.463
Sep-06 100.776
Oct-06 100.722
Nov-06 100.87
Dec-06 101.42
Jan-07 101.559
Feb-07 101.359
Mar-07 101.723
Apr-07 102.343
May-07 102.471

2007-11-29 02:37:45 · 1 answers · asked by Nicole 4

These two problems have to do with factoring polynomials by grouping...how do I do this? I need steps, not just the answer.

1. 10x^3 + 20x^2 + x +2
2. 2x^3 - x^2 + 2x -1

Thanks!

2007-11-29 02:31:24 · 6 answers · asked by musicalchik 4

If data collected of CO, plotting the data and fitting a curve to the resulting scatter plot yielded the function COs(x)=e^-2.465+0.028x, where x is the speed in miles per hour. The units for CO2(x) are grams per second (g/sec). Convert the CO to grams/mile, then determine the speed that minimizes the CO in terms of grams/mile.
grams/second(conversion factors)=(grams per mile)

If you can answer this in the next 30-40 minutes, I will bow to you. I need this solution for extra credit, and i spent 2 hours on it last night. Please Help, It would really be appreciated.

2007-11-29 02:28:00 · 5 answers · asked by Anonymous

A 820 N crate is being pulled across a level floor by a force F of 400 N at an angle of 33° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Find the magnitude of the acceleration of the crate.

2007-11-29 02:25:32 · 2 answers · asked by Anonymous

if there are 20 factors, what is the formula to solve this?

2007-11-29 02:16:17 · 4 answers · asked by Divine C 2

similarly decimal numeral system is also "base-10" system. what is it? i need the answers urgently as i am doing a maths project.

2007-11-29 02:10:49 · 7 answers · asked by dhruvi 1