Mathematics - 18 July 2007

the equation is:

x^2-x-17=0

2007-07-18 15:58:20 · 5 answers · asked by B. 2

27 - 5.3 -0.7 =

-5.2 - (-1.2) + 5.3 =

-3 x (-41) =






-17.5 - (-7.8) - (-1.2) =

-7.6 - (-1.6) + 3.3




fractions

16/6 + 16/7 - 18/4 =


3 1/3 + (-6 3/4) =



-2/3 - (-1/12) =



-5/6 + (-2/9)


5 2/3 + (-8 3/10) =


-2/3 - (-1/4) =


-2/9 + (-5/6) =

2007-07-18 15:51:44 · 3 answers · asked by Ghazala 2

How do you tell the difference between a linear differential equation and a nonlinear one? Thanks a lot.

2007-07-18 15:49:05 · 4 answers · asked by jimmycheesemaster 2

need help

2007-07-18 15:43:16 · 9 answers · asked by snyderman802000 1

1. A postal truck leaves its station and heads for Chicago, averaging 40 mph. An error in the mailing schedule is spotted and 24 minutes after the truck leaves, a car is sent to overtake the truck. If the car averages 50 mpg, how long will it take to catch the postal truck?

2. In the Klysler Auto Factory, robots assemble cars. If 3 robots assemble 17 cars in 10 minutes, how many cars can 14 robots assemble in 45 minutes if all robots work at the same rate all the time?

3. 3 times the first of 3 consecutive odd integers is 3 more than twice the third. What is the 2nd of the 3 consecutive odd integers? I did 3(x + x + 2 + x + 4) + 3 = 2(x +4) but didn't get it.

Thanks! Appreciated if you could show me all the steps algebraically.

2007-07-18 15:20:01 · 3 answers · asked by Anonymous

A baseball diamond is a square 90 feet on all sides. A player runs from first to second at a rate of 16 ft/s. At what rate is the player's distance from third base changing when the player is 30ft from first base?

2007-07-18 15:07:08 · 7 answers · asked by Lanksta 1

well this is a question i was unable to do.. we have to find the equation of a plane.. which is parallel to x-axis and we have the vector equation of the line.. so we need to cross product the direction vector of line and the other parallel vector to find the normal vector.. and then find the plane eq with the given pt on the line.. but the problem is what is the equation of the part.. PLANE PARALLEL TO X-AXIS? what will we denote it as and why???? help me ppllll

2007-07-18 15:05:58 · 4 answers · asked by Anonymous

2007-07-18 14:55:21 · 9 answers · asked by Anonymous

If r varies directly with s and t, and r= 20 when s = 2 and t = 5, what is the value of t when r = 40 and s = 5


please explain how to do this

2007-07-18 14:39:20 · 4 answers · asked by wu_4533 2

Please help....Thanks from a 7th grader

2007-07-18 14:36:54 · 3 answers · asked by Anonymous

Consider the following data that show temperature of a 1,000 g sample of water at normal atmospheric pressure as a function of heat supplied. A kJ can simply be thought of a unit of heat.


Temperature Heat Supplied
0 oC 0 kJ
10 oC 42 kJ
30 oC 126 kJ
50 oC 209 kJ
80 oC 335 kJ
99 oC 414 kJ
100 0C 420 kJ

Based on these data, please supply the following:
1. Provide a graph of the data. Is the graph sufficiently linear to allow prediction of heat supplied versus temperature in the range of 0–100 oC?
2. If so, use Microsoft Excel to provide an equation that relates heat, y, supplied to temperature, x, in the range of 0–100 oC.
3. Are the results consistent with the expected equation, heat = (1.00 cal/g oC) * mass in grams * (final temperature – initial temperature)?

Can anyone help me with this? I have no idea what to enter as the equation to get Excel to have something to work with.

2007-07-18 14:26:14 · 4 answers · asked by Stumped 4

How can you find the number of possible outcomes of a playoff between 2 teams where the first team that wins 4 games wins the playoff???

2007-07-18 14:22:56 · 2 answers · asked by E 1

Any ideas to solve this animal? Thanks!

*Obviously the power only applies to (x+1)

2007-07-18 14:21:37 · 5 answers · asked by Jorm 3

original number at the end of 20 days

2007-07-18 14:18:42 · 2 answers · asked by mario neil m 1

rule 10

f(x) = b^g(x)
then
f ' (x) = b^g(x) x ln b x g ' (x)

rule 11
f(x) = e^g(x)
then f ' (x) = e^g(x) x g ' (x)

i just wanted to know wheter the variable b and the variable e have a reason why they are that way or b and e are just the same. because i have to answer this problem and i dont know which one to use :s.

2007-07-18 14:13:50 · 2 answers · asked by Matt Jillian 2

what is the answer if you get it right i might make it the best answer. 23+5612-1234+7897x4562+4554=?

2007-07-18 14:09:00 · 11 answers · asked by Anonymous

2007-07-18 14:08:02 · 2 answers · asked by lyttle-lee j 1

Factor.
1) 784

2) 576

3)√ 675

4) PLEASE EXPLAIN. WHY CAN'T I TAKE 784/2 and /2???

5) Can I take √675 and divide 675/4=???

2007-07-18 13:47:53 · 10 answers · asked by Anonymous

Question:

If each group of numbers consist of six numbers,

the first five numbers may range between (1-36)

Whereas, the “S” or Superior number may range between the numbers (1-10)

Use the following numbers to determine the next group of numbers.

1, 7, 18, 19, 27 - S: 4

4, 7, 9, 14, 26 - S: 5

7, 9, 24, 32, 36 - S: 7

5, 12, 13, 16, 27 - S: 9

5, 7, 9, 22, 24 - S: 7

2, 3, 21, 25, 34 - S: 8

18, 28, 29, 34, 36 - S: 2

1, 14, 15, 25, 35 - S: 6

8, 14, 24, 30, 31 - S: 10

2007-07-18 13:46:06 · 3 answers · asked by justin j 2

I'm trying to find the area using left endpoint evaluation but i keep getting the answer wrong!

1) y = x^2 on [ -1,1 ]
n = 8 (number of rectangles)

so I find deltaX = ( 1 - (-1)) / 8 = .25

I now make a table, X values on left, f(x) values on right

Xo = 0 , 0
X1 = .25 , .0625
X2 = .5 , .25
X3 = .75 , .5625
X4 = 1 , 1
X5 = 1.25 , 1.5625
X6 = 1.5 , 2.25
X7 = 1.75 , 3.0625
X8 = 2 , 4

* f(x) values are found by plugging in X into y = x^2

I add f(x0) + f(x1) + .. (fx7) and get 8.75

To find the area, I must multiply 8.75 by deltaX (.25)..I get 2.1875. The answer in the back of my book says 0.6875.

Are my calculations wrong?

2007-07-18 13:36:43 · 3 answers · asked by sky l 1

{5x-2y=4
{3x+y=9

{5x-2y=4
{-2(3x+y=9)

{5x-2y=4
{-6x-2y=-18
+________
-x = -14
Wel... by then I realize its wrong.... The answer is supposed to be (2,3) but i dont see what I can be doing wrong, Plz show me I dont wanna get stuck and desperate like the last two nights....

2007-07-18 13:22:05 · 10 answers · asked by Poseidon 2

The indefinite integral (wrt x):

1 / (bx+ax^2)

Or, if you like:

1 / [x(b+ax)]

I suspect that this is IBP's, but I think I need to perform an algebra trick first to make it work...I don't know...any ideas from those in the know?

2007-07-18 13:13:56 · 2 answers · asked by powhound 7

f(x)=(e^(-8x))(cos(3x))

derivative is?

2007-07-18 13:02:41 · 3 answers · asked by Anonymous

i need help with these equations

2007-07-18 12:47:45 · 9 answers · asked by Anonymous

I only want to know what's the formula for getting distance.

2007-07-18 12:31:24 · 8 answers · asked by MarkAngelo 2

Please convert this degree/mins/sec into decimal form and vice versa.
(NOTE: I substituted the (*) as a degree)

40* 58' 48''

plss put the solution this is only a revie cause we have a test in this topic please help me understand to this one.

2007-07-18 12:29:34 · 4 answers · asked by MarkAngelo 2

2007-07-18 12:27:52 · 12 answers · asked by Anonymous

Find values for m and b in the following system so that the solution to the system is (-3,4).

5x + 7y = b
mx + y = 22

2007-07-18 12:14:50 · 5 answers · asked by jovanni k 1

Solve each of the following system by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
x + 5y = 10
-2x - 10y = -20

2007-07-18 12:13:10 · 4 answers · asked by jovanni k 1

given: 7[(7y/3)+10]=49
prove: y=-9/7

2007-07-18 12:05:40 · 3 answers · asked by Anonymous