Thursday

October 23, 2014

October 23, 2014

Posted by **red** on Monday, September 7, 2009 at 10:29am.

- math -
**red**, Monday, September 7, 2009 at 11:16amplease help me with this

- math -
**Ms. Sue**, Monday, September 7, 2009 at 11:42am-3 + 2 - 5 + 2 = ?

- math -
**MathMate**, Monday, September 7, 2009 at 12:00pmThe expression is a step function, which has discontinuities between ascents and descents.

Let the number of movements (ascents or descents) be i, and

h(i) = position relative to the surface after the ith movement.

h(0)=-3 (3 feet below surface)

h(1)=-1 (=-3+2)

h(2)=-6 (=-1-5)

h(3)=-4

h(4)=-9

h(5)=-7

...

So

h(i) = -(i/2)*3 -3 for 2|i (i divisible by 2), and

h(i) = -(i+1)/2*3 +2

= -(3i-1)/2 for 2|(i+1) (i not divisible by 2)

- math -
**MathMate**, Monday, September 7, 2009 at 12:03pmMs Sue, you're right. An expression can be all numeric!

**Answer this Question**

**Related Questions**

math - nemo is swimming 47 feet below sea level . he ascends 16 feet in the ...

physics - A submarine is patrolling the ocean. Each hour, it descends 25 feet ...

math - 1. A submarine was suituated 800 feet below sea level. If it ascends 250 ...

Math Ms.Sue please - 1. 2/3 - 5/4 -3 -3/12 23/12 -17/12 2. -6.1 + 1.7 7.8 -4.4 -...

physics - You are standing 7 feet from one speaker and 13 feet from another. ...

math - The portion of a swimming pool that is below the full water line measures...

math - A Dolphin is 30 feet below the surface of the water. She rised 23 feet, ...

Math - Please write an equation for the following problem: a seagull is gliding ...

math - mrs.Ayer is painting the outside of her son's toy box =, including the ...

Math - The portion of a swimming pool that is below the full water line measures...