If $87,495 is borrowed for 7 years at an annual simple interest rate of 8.355%, what is the total amount that must be repaid?

$138,666.45

Step-by-step explanation:

I = Prt, where

I = simplest interest = $87, 495

r = anual rate = 8.355% = 0.08355

t = time = 7 years

I = 87,495 * 0.08355 *7  = 51,171.45075 ≈ $51, 171.45

What is the total amount that must be repaid?

The money they have to be returned are the borrowed P,  and the interest I.

P +I = 87,495 + 51, 171.45 = $138,666.45

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