Find the angle between the vectors. (first find an exact expression and then approximate to the nearest degree.)a = 5, −1, 6, b = −2, 6, 3

the points given in  the question is [5,-1,6] and [-2,6,3]

the position vectors associated with these points are  given as

a=5i^-j^+6k^,b= -2i^+6j^+3k^

the dot product of these vectors are given as -

where α is the angle between them .

hence we have cosα=

here

and

hence a= and b=

hence cosα=

                   =5×[-2]+[-1]×6+6×3

                   =

                   =0.0362857507

hence α=2.07947 degree

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

b

step-by-step explanation: a third of 24 is 8, 8 times 3 is 24 so 8 - 2 would be 6