Mathematics - 29 September 2007

2007-09-29 16:07:56 · 9 answers · asked by Anonymous

solve:
4^x=9

please show me how u work it out

2007-09-29 15:51:11 · 4 answers · asked by yassem1ne 2

2007-09-29 15:44:19 · 4 answers · asked by Weedman 3

What does 555^2+2(555)(445)+445^2=?
495950
10000
495297
1000000
9986

2007-09-29 15:38:06 · 7 answers · asked by Anonymous

I have no idea how to do this one...i found a similar one where the distance was 15mph and the top speed was the same and the ans was 3 and 1/3

anyways heres the question
A motorboat goes 18 miles downstream at its top speed and then turns around and returns 18 miles upstream at top speed. The trip upstream took twice as long as the trip downstream. If the boat's top speed is 10 mph in still water, how fast is the current? (Hint: If the current speed is r miles per hour, then the motorboat travels at (10 + r) mph downstream and at (10 - r) mph upstream.)

Express your answer as a decimal rounded to the nearest hundredth.

2007-09-29 15:35:29 · 6 answers · asked by kailynflowers 1

If y is directly proportional to the square of x, and x=2 when y=12, then what is the value of y when x=3?


Thanks!

2007-09-29 15:27:46 · 5 answers · asked by Asa 1

2007-09-29 15:26:00 · 1 answers · asked by Weedman 3

The equation of motion of a particle, where s is in meters and t is in seconds, is given by the equation below.
s = 7 t 3 - 9 t
(a) Find the velocity and acceleration as functions of t.
v(t) 21t^2-9
a(t) 42t

acceleration at t 3
126m/s

what is the acceleration when velocity is at 0?
is this zerp as well? or how would I get this?

2007-09-29 15:23:37 · 4 answers · asked by m_carl 1

solve by linear combination

2007-09-29 15:13:42 · 8 answers · asked by MarieKatie 1

Divide 15 into two parts such that when the larger is divided by 3 and the smaller is divided by 2, the quotients are equal.
thx 4 answering!!!

2007-09-29 15:08:53 · 5 answers · asked by Platinum. 1

#1. 3 sqrt x^2y^3
#2. 4 sqrt 2

2007-09-29 15:07:18 · 2 answers · asked by white tea 1

for every positive integer n

where (n+1) and so on are indices.

2007-09-29 15:03:16 · 3 answers · asked by Joe 1

I am stumped as to how to solve for x in:

3/2 = x - (49/2x)

2007-09-29 15:01:24 · 5 answers · asked by Chris R 1

a^2=b^2+c^2-2bccosA

please how to proof

2007-09-29 15:00:46 · 3 answers · asked by Anonymous

f(x)=X+2cos(x)

find points at which the tangent line is horizontal

2007-09-29 14:25:34 · 2 answers · asked by deadman 2

f(x)=csc(x)+sec(x), 0
find the points at which the tangent line is horizontal

2007-09-29 14:24:11 · 1 answers · asked by deadman 2

2007-09-29 14:18:58 · 11 answers · asked by Anonymous

I'm trying to convert 3,700 mL into L's.
Would my decimal point be behind the number after the last zero, or will it be where the coma is????
I can't remember! Please help!

2007-09-29 14:18:48 · 8 answers · asked by Anonymous

2007-09-29 13:53:50 · 5 answers · asked by janvincent21 1

let f(x)=Ax + (B/x^2) where A and B are constants. Find values for A and B so that the line y=2x+1 is tangent to y=f(x) when x=-1.

I have no idea how to do this./

2007-09-29 13:42:43 · 1 answers · asked by Mr. Vill 1

Parallel to 2x+2y=8 and through (-1,-4)

2007-09-29 13:38:08 · 18 answers · asked by TAZ 1

What are the domain of these functions?

f(x) = 4x^4/3

g(x) = (2x^1/3)/3

h(x) = 6x^7/6

2007-09-29 13:36:17 · 2 answers · asked by Asa 1

2007-09-29 13:35:36 · 11 answers · asked by janvincent21 1

I'm doing a practice exam for our first Calc 1 test, and question 7 part b) asks: Find f'(x) of y=(x^5 + 4x^3 - x)^6. I know the formula for f'(x) is lim(h->0) [f(x+h)-f(x)]/h, and I can do this problem the traditional way but it would take FOREVER to take all of those x+h's to the different powers, then find the entire f(x+h) to the sixth power and f(x) to the sixth...

Given that this is just a part of one question.. and part a) was easy.. and the test has to be completed within an hour, there must be some exponential rules that allow this to be done much more quickly. Can anyone help?

2007-09-29 13:35:18 · 3 answers · asked by tcotier 1

Even if I use more zeros, so that 6 9/16 equals 6.5625 and then convert, I end up with, 6 45/8. Can this just not be done so that it will convert back out as 6 9/16 or I am just doing something wrong? Thanks.

2007-09-29 13:30:59 · 4 answers · asked by passmyged 1

2007-09-29 13:23:25 · 1 answers · asked by physics 1

I'm so stuck please help me!
Even if you can just do one question it will help!
Differentiate the following:
1) ln(1/x)
2) sin4x^3
3) cos^2(x^3)
4) tan^2(xe^x)
5) ln(sin^3(x^4))

6) If x and y lie on the ellipse x^2/a^2 + y^2/b^2 = 1, show that the slope at any point is given by dy/dx = -(b/a)^2(x/y)

Thank you if anyone helps me! :) x

2007-09-29 13:19:03 · 4 answers · asked by Hayley* 3

What is the domain of the following polynomial

f(x)=( 4x ) / ( x^2 + 2x -6 )

2007-09-29 13:13:46 · 3 answers · asked by brettmhannan 1

y1(x) = 1/ square root of 9 - x2
y2(x) = x^3 + x / x - 2

Describe all the asymptotes (horizontal, oblique or verticals) to these graphs?

Sketch each graph

2007-09-29 12:24:05 · 1 answers · asked by Anonymous

a) a particle moves along the x - axis with velocity v = dx/dt = f(x). Show that its acceleration is f(x)f'(x)

b) The volume of a sphere is decreasing at the rate of 12pim^3/min. Find the rate at which the radius and the surface area are changing at the instant when the radius is 20m. Also find approximately how much the radius and surface area may be expected to change in the following 6 sec.

2007-09-29 12:18:26 · 1 answers · asked by DaOne 1