Question

Help please Pre-Calc. It is part of statistics

Answer 1

\[\sum_{0}^{6}(3n-2x)=7\] Solve for x.

Answer 2

\[3\sum_{0}^{6}n - \sum_{0}^{6}2x = 7\] Summation rules give you this.
\[3(\frac{ 6(6+1) }{ 2 }) - \sum_{0}^{6}2x\] (I'm assuming you know how to get to this step. If not, I can clarify)
\[63-\sum_{0}^{6}2x = 7\] Simplify.
\[\sum_{0}^{6}2x = 56\] Summation of a constant is always that constant, so now you can go to 2x=56
x=28

Answer 3

Ohh ok thanks that truly did help a lot.

Answer 4

But can you clarify that one step. I am kind of stumped on that but the rest I get.