Asked by Bello Boluwatife

The 4th term of an Ap is 6. if the sum of the 8th and 9th terms is -72,find the common difference
Answered by Anonymous
t(4) = 6 ---- a + 3d = 6

t(8) + t(9) = -72
a+7d + a+8d = -72
2a + 15d = -72
double the first equation
2a + 6d = 12
subtract them
9d = -84
d = -84/9 = -28/3
Answered by Timothy
Please how did you get -28/3
Answered by Akintola Ayomide
The first and last terms of an arithmetic progression are 1 and 121 respectively. Find
1.the number of terms in arithmetic progression
2.the common difference between them if d sum of its terms is
(a) 549. (b) 671. (c) 976.
(d) 1281
Answered by Lawrence
Plz can i get d solving of dis question
Answered by Anonymous
You are right thanks Alot
Answered by Divine
You are doing well
Answered by Anonymous
This answer isn't correct
Answered by Muhammad Sani Ahmad
the first winner lottery get #2000 while subsequently winners get #50 less than the proceeding winner how much will the winner the 20th position get
Answered by Roseline chincherem
91/3
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