Which number will fit in '?' place in the following series?

 

12, 23, 45, 89, ?

 

What is the sum of the first 11 terms of an arithmetic progression if the 4th term is 11 and the 7th term is -4?

What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?

What least number must be added to 4131, so that the sum is completely divisible by 19?

The 3rd and 9th term of an arithmetic progression are -8 and 10 respectively. What is the 16th term?

What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?

A number is greater than 58 times its reciprocal by 3/4. What is the number?

The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?

The 3rd and 8th term of an arithmetic progression are -14 and 1 respectively. What is the 11th term?