Gavin is building a a fence. He needs to put a post every 4 1/2 feet,. If a new segment of a fence has 12 new post, using the last post from the previous section of fence as a starting point, how long is the new segment fence?

1/12 x = 4 1/2

A.)16 1/2
B.)54 feet
C.)48 feet
D.)48 1/2

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12

a box 3 3/4 feet long or 4+ feet.

step-by-step explanation:

y do u put "subscirbe to ence" on a app for ppl who need with their work?

the first one

step-by-step explanation:

just id the test.