Select the correct answer. will is at a shirt sale where he can buy one and get a second one for 40 percent off. he wants to buy two shirts priced at $29 each. how much will he pay? cost after discount = (2 × list price) – (list price × discount percentage) a. $34.80 b. $40.60 c. $46.40

C

Step-by-step explanation:

Givens

Original cost = 29 dollars.

Discount = 40% on the second shirt.

Formula

cost after discount = (2 × list price) – (list price × discount percentage)

Solution

Cost after discount = 2 * 29 - 29*40/100

Cost after discount = 58 - 11.60

Cost after discount = 46.40

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

47 - 90 = 43

43 - 180 = x

x = 137