Help me plz im in pain plz

= 510

Step-by-step explanation:

Formula for the sum of n terms of a finite arithmetic series is

S_n=\dfrac{a_1+a_n}{2}\cdot n.

If n=10,\ a_1=13,\ a_{10}=89, then

S_{10}=\dfrac{13+89}{2}\cdot 10=51\cdot 10=510.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant