Carrie is making a bed skirt for her twin beds. one side of the a mattress measures 39inches, and another side measures 75inches. how many feet of fabrics will carrie need to make skirts for both beds?

  38 feet

Step-by-step explanation:

The perimeter of one mattress is twice the sum of the given side lengths, so is ...

  P = 2(75 in + 39 in) = 228 in

Then the perimeter of the two beds will be ...

  total length = 2 × 228 in = 456 in = 38 feet

There are 12 inches in a foot. (456 in)/(12 in/ft) = 38 ft

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

ian gone lie this got me confused

step-by-step explanation: