Select the sets of ordered pairs that represent a function.
A- (5, -2), (1, 7), (8, 4), (0, 5), (5, -2), ( -3, 0)

B- (-2, 1), (2, 5), (3, -2), (1, 6), (-4, -2), (3, -4)

C- (7, 5), (-5, 5), (6, -2), (7, 6), (4, 8), (-2, 6)

D- (4, 1), (-2, 1), (-3, 1), (1, 1), (-5, 1), (8, 1)

E- (1,- 1), (8, -4), (6, -6), (5, -3), (9, -2), (6, 7)

F- (-18, 15), (22, 35), (31, -23), (15, 0), (-14, -2), (1, 6)

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

hope this .

r3t40

answer: 2x + 2 − 2 = 10 − 2; subtraction property of equality

step-by-step explanation: