Solve.
betty buyer purchases a stereo system for $225.00. she pays the store $25.00 down and finances the rest ($200.00). she also agrees to pay $20.00 per month for 12 months.
her finance charge = $__
apr = __%

Step-by-step explanation:

The amount Buyer pays for the financing is ...

  ($20/mo)×(12 mo) = $240

Since she is financing $200, her finance charge is ...

  $240 -200 = $40

__

The interest this represents on a loan of $200 can be found using a financial calculator or spreadsheet. It is a little more than 2.92% per month. On an annual basis, it is 35.07%.

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.