When mary was born she weighed 8 pounds when she was 10 years old she weighed 10 times as much how much more did mary weighed when she was 10 years old than when she was born use exercises 1-2 yo answer te question draw a picture erige and solve an equation to find mary weighed w when she 10 years old

well 8 times 10 = 80

Step-by-step explanation:

she weighed 72 more pounds

Step-by-step explanation:

multiply 8 by 10 to get 80 then subtract 8 from 80 to get 72 as your answer

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