(need answers asap) a news reporter wants to estimate the percentage of registered voters who will vote for a particular candidate in an upcoming election.

which statement describes a method that will him accurately estimate this percentage?

he could contact every resident in the town, ask whether the resident will vote for the particular candidate, and then calculate the percentage of residents who say they will vote for the particular candidate.

he could ask his readers to respond to a survey that asks which candidate the reader will vote for and then calculate the percentage of people who say that they will vote for the particular candidate.

he could take a random sample of registered voters, and then calculate the percentage of the sample who will vote for the particular candidate.

he could ask employees at the newspaper which candidate each will vote for, and then calculate the percentage who will vote for the particular candidate.

He could take a random sample of registered voters, and then calculate the percentage of the sample who will vote for the particular candidate.

Step-by-step explanation:

he could take a random sample of registered voters, and then calculate the percentage of the sample who will vote for the particular candidate.

Step-by-step explanation:

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