Find 26th term in the arithmetic sequence: -15,-35,-55,-75,...
2 answers:
Answer:
Step-by-step explanation:
hello :
-75-(-55) = (-55)-(-35) = (-35)-(-15)=-20
the ratio diff is : d=-20
the nth term is :An=A1+(n-1)d A1 =-15
An=-15+(n-1)(-20) = 15-20n+20
An = -20n+5
26th term when : n=26 A26 = -20(26)+5 = -515
A26= -515
Answer:
-515
Step-by-step explanation:
In this example the first value is −15 and every value afterwards is 20 less.
After substituting these values to above formula, we obtain:
All we have to do is add 25 twenties or 25 x 20 = 500 and -15 - 500 = -515
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