Mathematics - 30 July 2007

How do I find the radius of a sector of a circle if:

the area of the sector is 9.817 and the degree measure of the arc is 22.5.

How do I find the Radius??

2007-07-30 13:25:15 · 6 answers · asked by ems 2

Since (-x)^2=(x)^2, we have log (-x)^2=log(x)^2, whence 2 log(-x)=2 log (x), and thence log (-x)=log(x).

What in the world does this mean????

2007-07-30 13:18:00 · 5 answers · asked by Mike 2

In /\ABC, a line drawn from vertex A intersects BC in D. If m

2007-07-30 13:11:02 · 4 answers · asked by blahhhhhh 2

Multiply and Simplify...
y^2-16/y^2+8y+16*3y^2-5y-2/y^2-6y+8
3y+1/y+4
Am I on the right track?

2007-07-30 12:59:54 · 3 answers · asked by Jacesmom 2

(a) what is th circumference of one wheel
(b) how far would the ike travel in 100 revolutions(turns) of the wheels

2007-07-30 12:56:43 · 6 answers · asked by jaktalebojeal 1

For a certain type of nonlinear spring, the force required to keep the spring stretched a distance s is given by the formula

F = ks^(4/3).

If the force required to keep it stretched 8 inches is 2 pounds, how much work is done in stretching this spring 27 inches?

Amount of work done:________ inch pound(s).

2007-07-30 12:02:04 · 3 answers · asked by goodguy083 1

2x +5y =16,

4x-3x = -7.

The first prob is over the second one

2007-07-30 11:41:11 · 11 answers · asked by lil_danca06 4

Take prime numbers: 2,3,5,7,11,13,... and write the difference between any consecutive numbers: 1,2,2,4,2,...; then do the same with this new sequence: 1,0,2,2,...; and over and over...
Can you prove that the first number is always 1 (except the original sequence of primes of course)?

2007-07-30 11:37:39 · 6 answers · asked by smvc 1

Find the area of the green shaded portion of the circle with a given radius of 9 units. Use pi = 3.14 diagram show green shaded area with a given radius of 9 and an orange area with angles of 100 degrees, can anyone help


20.42 units squared

.65 units squared
7.85 units squared
183.69 units squared

2007-07-30 11:30:09 · 3 answers · asked by sockless_1 1

2007-07-30 11:11:54 · 4 answers · asked by Anonymous

with 8 sides????

2007-07-30 11:10:48 · 4 answers · asked by Anonymous

Solve the problem.
Two angles are said to be complementary if their sum is 90. If one angle measures (27) / (x) degrees, find the measure of its complement.

( 90 x - 27 ) / ( x)
( 90 x - 63) / (x)
27
63

2007-07-30 10:55:36 · 3 answers · asked by Anonymous

2007-07-30 10:49:06 · 7 answers · asked by danetteeblount 1

Perform the indicated operation. Simplify if possible.
(2) / ( x + 4) + (9) / (5x + 20 )

(19) / (5x + 4)^2

(11) / (5x + 4)

(47) / ( 5x + 4)

(19) / ( 5x + 4)

2007-07-30 10:43:59 · 2 answers · asked by Anonymous

A highway patrol airplane flies 3 mi above a level, straight road at a constant rate of 120 mph. The pilot sees an oncoming car and with radar determines that at the instant the line-of-sight distance from plane to car is 5 mi the line-of-sight distance is decreasing at the rate of 160 mph. Find the car's speed along the highway.

The answer in the back of the book is 80 mph. I have no idea where to start.

2007-07-30 10:30:58 · 3 answers · asked by salmonella_jr 3

2007-07-30 10:22:52 · 10 answers · asked by Anonymous

the formula for the surface area of a sphere is 4πr^2 (π is pi by the way, it looks weird here), but i was wondering... what is the radius exactly? would it be wrapping a belt around a ball and cutting that in half or driving a stick through the middle to get through the other side, and taking half of that? (in other words half of the equator or half the axis?)

2007-07-30 10:19:20 · 7 answers · asked by Fundamenta- list Militant Atheist 5

1. Find the slope of the line that passes through the points (2, 3) and (5, 8).




2. Find the equation of the line that passes through the points (3, -2) and (4, -2).




3. Find the equation, in standard form, with all integer coefficients, of the line perpendicular to x + 3y = 6 and passing through (-3, 5).

1. Simplify and evaluate:
(42x3y-2z-3/x-5y8z-9)2




2. Convert to scientific notation (here you may use x as multiplication):
0.00083




3. For f(x) = 6x – 7, find f(2).




4. Perform the indicated operations:
(-x2 – 6x + 3) – (-9x2 + x – 1) – (x2 + 5x – 2)




5. Use FOIL to multiply:
(8x – 1)(2x + 5)




6. Multiply:
(x4 – 4x2 – 5)(x2 – x + 2)

Thank you so much in advance. I know there are alot of math whizs out here much smarter than me. Please help me out, much love and appreciation!

2007-07-30 10:04:46 · 4 answers · asked by princessmommy05 2

Solve the equation: -8.2n = -41

2007-07-30 09:54:48 · 4 answers · asked by mathmakesmecrazy 1

Evaluate: -1.8 - 3.2 + 2.4

* if you could show me how you get to the answer that would help a lot thanks : )

2007-07-30 09:52:25 · 4 answers · asked by mathmakesmecrazy 1

1) Solve the following equations algebraically. Show all work.

a) cuberoot(x) -5=3
b) x 3/2=27
c) 3/4=1 -3x-2/x+1

2007-07-30 09:15:34 · 4 answers · asked by Anonymous

(t^2 + t -6) / (3t^2 -27)

Thanks

2007-07-30 09:11:11 · 9 answers · asked by Aimee R 1

The half life of radioactive postassium is 1.3 billion years. If 10 grams are present now, how much will be present in 100 years?? 1000 years??

I said, amount now = amount intial / 2 ^ t/half life

so

10 / 2 ^ 100 / 1300000000 and got 9.99

then

10 / 2 ^ 1000 / 1300000000 and got 9.99

is this right???

please tell me where I went rightTHANKS

2007-07-30 08:50:22 · 3 answers · asked by Anonymous

I'm going on a diet, & to closely monitor my calorie intake, I'm reading the nutrition facts pannel of everything I eat. Problem is, in Poland (I'm on vacation), they don't have a very descriptive nutrition pannel. It shows how much sugar & fat there is in the food, but not how much calories. I'm good at math & if I can somehow convert fat to calories I can lose alot of weight. Help?

2007-07-30 08:40:42 · 4 answers · asked by Markiiphobia™ 4

I thought that the coefficient of determination ranges between 0 and 1, but apparently that is not the answer to the question. I have an R square value of 0.826 how do I test this value to conclude that it is greater than 0?

2007-07-30 08:34:37 · 2 answers · asked by Newlywed 1

2007-07-30 08:30:39 · 4 answers · asked by penn_state21 1

I bought a video game for $50.00.
I didn't like it, so I took it to Gamestop for $20.00.
So then I used the $20.00 I got from that game to purchase another game that was selling for $40.00.
At the end I had to pay $20.00 dollars out of my own pocket to pay for the game since I used the $20.00 I got from the other game.

Thanks

2007-07-30 08:30:11 · 3 answers · asked by I'mdabess 2

Sally worked from 10:45-9:00 on 7.50/hr...how much money is that minus the tax? Sally lives in NY by the way...

2007-07-30 08:13:51 · 10 answers · asked by Anonymous

The question is the following:
How many years would it take an amount of money to triple if it is invested at 5% compounded continuously?

The choices for answers are the following:
ln3
5ln3
10ln3
20ln3
25ln3
2ln3

I don't need the answer necessarily, but how to solve these types of problems?

2007-07-30 08:13:04 · 5 answers · asked by Anonymous

Can anyone explain this?

2007-07-30 08:11:44 · 8 answers · asked by andrew l 2