# Week 1 – Precalc 11

For the first week of our Math pre-calculus class, we have learned about arithmetic sequences and series. I had been familiar with arithmetic sequences, but had never learned about series’, and the equations and calculations that create them. I learned about the formulas you can use to find the necessary numbers for solving a full arithmetic sequence and series.

Such as : $t_n$ = $t_1$ + d(n – 1)   to solve the value of a term you don’t know yet.

or : $S_n$ = $\frac{n}{2}$($t_1$ + $t_2$)   to solve the sum of a certain amount of terms in a series.

Both of these help out a ton in solving these patterns.

Another thing I learned, that will help out lot’s in the future, is that an equation without powers is a linear equation.

Example : 17- 5n + 5 = -38    will be a linear equation as there are no powers in it.