Question

Sequence with an equation...

Answer 1

@BrandonH4499

Answer 2

you can find the sum with this formula
\[\Large{
S_n=\frac{(a_1+a_n)\times n}{2}
}\]
then you need a_1 and a_10 from the equation a_n=2n-3

Answer 3

replace n by 1 and 10
a_1=2(1)-3=-1
a_10=2(10)-3=17
\[\Large{
S_{10}=\frac{(-1+17)\times 10}{2}\\
S_{10}=80
}\]

Answer 4

Ooooh I see Thanks! I was processing all that!

Answer 5

you're welcome