8x-3x=20show work to receive credit .

Assuming that you're solving for x your answer is going to be x = 4

Step-by-step explanation:

Take 8x-3x=20 - Simplify the x's to get 5x (8x-3x=5x)

5x=20 (Divide the 5 into the 20 to get x by itself) x = 4 ( x = 20/5 )

After doing that you'll get the final answer of x = 4

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

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation: