Robbie returned an acoustic guitar that cost $245.75. He bought a bass guitar that cost $368.45. Which statement is true? A. The sum 245.75 + (–368.45) = –122.70 means that Robbie still owes $122.70 for the bass guitar. B. The sum 245.75 + (–368.45) = –122.70 means that Robbie will receive a refund of $122.70. C. The sum –245.75 + 368.45 = 122.70 means that Robbie still owes $122.70 for the bass guitar. D. The sum –245.75 + 368.45 = 122.70 means that Robbie will receive a refund of $122.70.

A. The sum 245.75 + (–368.45) = –122.70 means that Robbie still owes $122.70 for the bass guitar.

Step-by-step explanation:

Since Robbie returned a guitar that cost $245.75, he will be recieving a positive amount of money, being a gain of money; then he decides to buy a bass guitar, which costs $368.45, which makes it a loss of money, thus A would be the correct answer.

the answer is a

step-by-step explanation:

because your just changing the position of where the shape is

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