The box plots show the average gas mileage, in miles per gallon, of the cars sold at a dealership in June and in December
Gas Mileage of Cars Sold in June

which inference can be made about cars?

a) The type of cars sold in June typically gets better gas mileage

b) The type of cars sold in December typically gets better gas mileage

c) The type of cars sold in the two months typically get about the same gas mileage

d) The types of cars sold in the two months typically get better gas mileage then those sold in other months

please help, thanks!

C

Step-by-step explanation:

I took the test

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