On a Number line the directed line segment from Q to S has endpoints Q at -8 and S at 12. Point R Partitions the direct line segment from Q to S in a 4:1 ratio. Which expression correctly uses the formula (m/ m + n)(x2 -x1) + x1 to find the location of point R? The options are:

* (1/1+4)(12-(-8))+(8)

*(4/4+1)(12-(-8))+(-8)

*(4/4+1)(-8-12)+12

*(4/1+4)(-8-12)+12