
Arithmetic Sequence
In an arithmetic sequence, the 11th term is 53 and the sum ofof the 5th and 7th terms is 56. Find the first 3 terms of the sequence.
I'm trying to use the formula: tn= t1+(n1)d but cant figure out where to get the numbers. Please step by step on how to get answer would be really helpful. Thanks

Re: Arithmetic Sequence
Using the given information, we obtain two equations in two unknowns:
If we subtract the first equation from the second, we will eliminate and we can solve for . Then we can use this value to find from either of the original equations.

Re: Arithmetic Sequence

Re: Arithmetic Sequence

Re: Arithmetic Sequence
oh sweet thanks so much! d=5 i got it now. everything fell into place :)

Re: Arithmetic Sequence