Saturday

August 23, 2014

August 23, 2014

Posted by **Jayson** on Tuesday, January 10, 2012 at 9:07pm.

a) 2140/(w+400) = 1860/(w-400)

b. 2140/(400+w) - 1860/(w-400)=2140-1860/w

c) 2140/(400+w) = 1860/(400-w)

d) 2140/(400+w) - 1860/(400-w) = 650

2. What is the average rate of change of f(x)= (x-5)/(x+3) from x=-2 to x =4?

a) 24/7

b) 8/7

C) -25/21

D) -11/3

Can someone explain to me what to do with the denominators? thats the only thing I am confused about. I know that you plug in -2 for x, f(x)= (x-5)/(x+3)

Y2-Y1/X2-X1

- Math -
**Jayson**, Wednesday, January 11, 2012 at 12:05amanyone?? D:

- Math -
**Steve**, Wednesday, January 11, 2012 at 12:07amI assume you got C for #1.

Time = distance/speed

The two times are equal

#2.

f(-2) = -7/1

f(4) = -1/7

So, over an interval of 6 units, y changed from -7 to -1/7 = +48/7

So, the average change per unit is (48/7)/6 = 8/7

- Math -
**Jayson**, Wednesday, January 11, 2012 at 12:59amHow did you get the denominator 1 and 7? That is what I am confused :3

- Math -
**Steve**, Wednesday, January 11, 2012 at 3:59pmYou're kidding, right?

f(x)= (x-5)/(x+3)

f(-2) = (-2-5)/(-2+3) = -7/1

f(4) = (4-5)/(4+3) = -1/7

**Related Questions**

math - When an airplane flies with a given wind, it can travel 3000 km in 5hrs. ...

Algebra 2 - An airplane flies 1050 km with the wind. In the same amount of time...

Pre-Algebra - Question is: What is the algebraic equation to determine when they...

Pre-Algebra - Question is: What is the algebraic equation to determine when they...

algebra - A Boeing 747 flies 2420 miles with the wind. In the same amount of ...

Physics/Math - After flying for 15 min in a wind blowing 42 km/h at an angle of ...

math - an airplane flew with the wind for 30 minutes and returned the same ...

algebra - An airplane takes off from an airport and takes 6.5 hours to fly west...

11 - How do I work this problem? Flying with the wind, an airplane can travel ...

Math - An airplane flying at a speed of about 100 mph was once overtaken and ...