Arectangular prism has a base with a length of 8 cm and a width of 5 cm. the volume of the solid is 120 cm³. the volume of this prism can be found using the formula, v = lwh

rearrange the volume formula to solve for h. what is the new formula?

The answer to your question is: h = 3 cm;

Step-by-step explanation:

Data

l = 8 cm

w = 5 cm

V = 120 cm³

h = ?

Formula

V = lwh

Process

1.- Pass l and w to the right side, they are multiplying, then now they will be dividing.

2.- Substitution

                   h = 3 cm

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

i believe the correct answer is b.