+2401 https://web2.0calc.com/questions/i-am-having-trouble-with-this-question-on-a-semester-review
See if you can figure it out from this problem.
We need the starting term (a_1) and we to know how much you increase/decrease from term to term.
=^._.^=
I was having trouble on how to find the common ratio. at first i was thinking as taht i needed to treat a_4 like a problem such as a_2=41 therefore 41=a_1*r but i can't figure out how to format it that way or if im even on the right path.
+2401 You're solving for geometric, not arithmetic.
First, we need to look for the common ratio.
x, x + y, x + 2y, x + 3y, x + 4y, ...
a_4 = x + 3y
a_16 = x + 15y
Subtract those 2 equations.
125-41 = x + 15y - (x + 3y)
84 = 12y
y = 7 (that's the common ratio)
a_4 = x + 3y
41 = x + 3(7)
x = 20
So our first term is 20, then we add 7 for the next term.
a_n = 20 + 7(n-1)
=^._.^=
pls help ;-;
