Answer: B) 115
Step-by-step explanation:
S₅ means the sum of the first 5 terms.
3 + 13 + 23 + 33 + 43 = 115
You can also use the formula:
[tex]S_n=\dfrac{a_1+a_n}{2}\times n\\\\.\quad =\dfrac{3+43}{2}\times 5\\\\.\quad =\dfrac{46}{2}\times 5\\\\.\quad =23\times 5\\\\.\quad =115[/tex]
