I have to think this again. be back later. X=2.22
6(2a-b)+46 Then when you simplify it : 12a-6b+46
X=-2.666666666666666666667
x= -2.67 rounded
<span>The first thing to know is that "an" and "a1" are names with subscripts and are and different from multiplication.
an = a1 + (n-1) d
add -a1 to both sides
an - a1 = a1 - a1 + (n-1) d
</span><span>an - a1 = (n-1) d
</span>d = (an-a1)/(n-1)
