Mathematics - 14 November 2007

Solve by using systems of equations.

2007-11-14 10:28:32 · 11 answers · asked by sue m 2

A. 5(x^3)^4 (3x^2)

B. (x^4-4x+3)/ ((√x)+1)

The answer for A. is:
180x^13 + 30x^13

The answer for B. is:
(2√x ((√x)+1)(4x^3-4) - x^4 - 4x+3) / ((2√x)((√x)+1)^2)
I'm not sure how to get the answers! Please help!!

2007-11-14 10:23:15 · 3 answers · asked by NEpatriots12 2

I had to do a few problems. I'm just checking if they are right. Thanks.

2x = 26
x = 13

4x = -12
x = -3

6x = 72
x = 12

8x = 808
x = 101

10x = 130
x = 13

12x = 360
x = 30

3x = 99
x = 33

6x = 96
x = 16

2007-11-14 10:21:00 · 8 answers · asked by Anonymous

can anyone show all the steps to work out what x is equal to??

3( x/2 + 7 ) = ( x/5 + 2 )

2007-11-14 10:15:52 · 11 answers · asked by Anonymous

2007-11-14 10:14:58 · 1 answers · asked by Anonymous

A lamina has the shape of a closed region bounded by the graphs of x^2 + y^2 = 4 and x + y = 2, and has the density
p(x,y) = x*y. Write the iterated integral for the moment of inertia about the y-axis. Then evaluate the integral.

I am unsure about how to write the bounds for this, I suppose you could use polar form and write r=2, but I am not too sure how to go from there if that is the case in terms of bounds etc. to set it up properly.

2007-11-14 10:11:03 · 1 answers · asked by offycakes 1

Suppose you were a packaging engineer.Explain why you might want to know the total are of all the faces of a rectangular box.

2007-11-14 10:09:15 · 5 answers · asked by @(3x!$ 2

i dont want the answer to this as much as i need a clear step by step method of how it is done, and why any important stages happen. my question is

y = (e^-t)sin 2t

show y is a maximum when t = 1/2 arctan 2

i know that dy/dt = 0 when y is a maximum
and i got dy/dt = (e^-t )(sin 2t + 2cos2t)

but dont know if that last bit is correct. assuming it is, i still don't know where to go from here?

2007-11-14 10:07:59 · 3 answers · asked by martin r 1

Solve the problem by using systems of equations.

2007-11-14 10:06:30 · 6 answers · asked by sue m 2

Given the same sample statistics, which level of confidence will produce the narrowest confidence interval?

10 Points to best answer.

a. 90
b. 95
c. 85
d. 75

2007-11-14 09:59:41 · 1 answers · asked by deanjp 2

Solve this linear programming mixture problem: A small stereo manufacturer makes a receiver and a CD player. Each receiver takes 8 hours to assemble, 1 hour to test and ship, and earns a profit of $30. Each CD player takes 15 hours to assemble, 2 hours to test and ship, and earns a profit of $50. There are 160 hours available in the assembly department and 26 hours available in the testing and shipping department. What should the production schedule be to maximize profit? What is the maximum profit?

I've got:

x being the stereos
y being the CD players

theres 160 hours for assembly so
8x+15y<160

theres 26 hours for shipping
x+2y<26

Then
x>0 and y>0 as givens
How do I graph the feasible region?
I don't have a graphing calculator =[

2007-11-14 09:50:38 · 2 answers · asked by Anonymous

Some examples are
csc^-1(14/4) Just not sure how to figure these out?

sec^-1(3.5) to 2 decimal places

cot ^-1 to 2 decimal places.

2007-11-14 09:41:33 · 2 answers · asked by Angel 1

2007-11-14 09:40:16 · 4 answers · asked by jen g 1

3.066 divided by 0.3

2007-11-14 09:39:13 · 2 answers · asked by Anonymous

2007-11-14 09:36:09 · 1 answers · asked by jiles357 1

2007-11-14 09:36:08 · 12 answers · asked by Dora S 1

identify common factors and simplify, 1024/288, x:4x^3, and 16x^2y^3:12x^y. i just cant figure these three out please help

2007-11-14 09:28:45 · 3 answers · asked by Anonymous

This problem has been blowing me mind for a soild hour can someone can please help me so i can sleep tonight

integrate:

5 / ((3e^x)-2) dx

2007-11-14 09:25:24 · 3 answers · asked by Anonymous

2007-11-14 09:23:59 · 3 answers · asked by jiles357 1

2007-11-14 09:23:21 · 14 answers · asked by Anonymous

2007-11-14 09:16:01 · 2 answers · asked by Angel 1

What is the volume of the tank? Round answer to nearest cubic foot?
A propane tank is made up of a cylinder with hemispheres
on each end. If the total length of the tank is 6 feet and
height is 2 feet,what is the volume of the tank? Round
answer to nearest cubic foot?

I don't know what they mean by 'height' here. I think they mean the tank is lying on its side, so 2 ft would be the diameter of each hemisphere, and the diameter of the cylinder.

That makes the radius 1 ft.
a sphere with a radius of 1 foot.

Volume of a cylinder = 3.14 x r^2 x height
=3.14 x radius x radius x height

Volume of a sphere = 4/3 x 3.14 x radius^3
= 4/3x 3.14 x radius x radius x radius

Volume of a hemisphere =4/3 x 3.14 x radius x radius x radius x 1 /2

2 Hemispheres makes one sphere
Volume of composite solid=Volume of a cylinder + Volume of a sphere

(3.14 x 1 x1 x 6 ) + (4/3 x 3.14 x 1 x 1 x 1) =
18.84 + 4.18666666 =23.02666666
Round answer to nearest cubic foot? answer is 23
volume of cylinder is 3.14x1x1x6=18.84 or 3.14x1x1x4 = 12.56?

2007-11-14 09:11:10 · 4 answers · asked by Anonymous

2007-11-14 09:03:33 · 3 answers · asked by Ben 1

How do I verify this Identity using double and half-angle identies?

tan(x/2 - pi/4) = tanx - secx

2007-11-14 08:59:40 · 1 answers · asked by Oztac 1

5h-h=16

10n=2n-6=42

2007-11-14 08:51:56 · 3 answers · asked by Claire H 1

Three new ink cartridges cost $9 less than 5 new ink cartridges. Write and solve and equation to find the cost of each in cartridge!

2007-11-14 08:47:26 · 3 answers · asked by Anonymous

should it not just be the function? cos(t) / t or.. cos(x) / x please explain thanks

2007-11-14 08:45:01 · 2 answers · asked by Anonymous

2007-11-14 08:40:06 · 2 answers · asked by gkoz316 2

I know that this series converges, but I need an explanation of this. The series is from n=1 to infinity of (-1)^n+1(ln (n)/n)

2007-11-14 08:39:30 · 2 answers · asked by Dan H 2

I need help i can't do this without help.

2007-11-14 08:37:35 · 24 answers · asked by Sarah S 1