Wednesday

November 26, 2014

November 26, 2014

Posted by **Anonymous** on Saturday, March 29, 2008 at 4:29pm.

a) a + b

I got sqrt3, but the answer at the back of the book says sqrt11.

2) If D(3,4,5) and E(-2,1,5) are points in space calculate each expression and state what it represents.

|OD|

can you please do those and explain steps.

- Math -
**Damon**, Saturday, March 29, 2008 at 4:33pma + b = (3-2) i +(2+1) j +(-1+0) k

= 1 i + 3 j -1 k

sqrt (1^1 + 3^2 + (-1)^2 )

sqrt ( 1 + 9 + 1)

sqrt (11)

The book wins again :)

- Math -
**Anonymous**, Saturday, March 29, 2008 at 4:39pmWow I accidentally put a - in front of 2 and ended up with -1. Thanks!

- Math -
- Math -
**Damon**, Saturday, March 29, 2008 at 4:37pm2) If D(3,4,5) and E(-2,1,5) are points in space calculate each expression and state what it represents.

|OD|

-------------------

I assume 0 is the origin (0,0,0)

so OD = (3-0)i + (4-0) j + (5-0) k

and

|OD| = sqrt (3^2 + 4^2 + 5^2)

=sqrt (9 + 16 + 25)

= sqrt(50)

= 5 sqrt(2)

**Answer this Question**

**Related Questions**

Math - Find the exact solution(s) of the system: x^2/4-y^2=1 and x=y^2+1 A)(4,...

Algebra - Find the exact solution(s) of the system: x^2/4-y^2=1 and x=y^2+1 A)(4...

to bobpursley,math,correction - (sqrt3 + 5)(sqrt3 -3) ? multiply that out sqrt3*...

Algebra - Find a polynomial function of degree 3 with the given numbers as zeros...

Calculus - Find the equation (in terms of x and y) of the tangent line to the ...

Algebra - Rationalize denominator, all variables positive real numbers and ...

Algebra II (check) - Assume that no denominator equals 0. sqrt12 - sqrt18 + ...

Calculus - Hi. How can I integrate 1/(X^3 +1) ? Thank you to anyone who can help...

calc - let v=i+j+k and w=-2i -k find the magnitude of teh projection of w onto v...

algebra - Can someone help me with this problem please? rationalize the ...