Enter the following transactions into Richard’s checkbook register and state his ending balance: Date
Type
Description
Amount
03/01
Check #204
Blue Sky Apartments
$455.00
03/05
DEP
Payroll automatic deposit
$390.36
03/08
Debit
Benny’s Hamburgers and Fries
$9.20
03/15
Check #205
Car payment
$251.59
03/19
DEP
Payroll automatic deposit
$390.36
a.
$715.79
b.
$1,009.81
c.
$780.72
d.
$880.24

it’s b

Step-by-step explanation:

b cause

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

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads