Find the sum given below: $-5 + (-8) + (-11) + \ldots + (-230)$

How many terms of the $AP : 9, 17, 25, \ldots$ must be taken to give a sum of $636$?

Write the first four terms of the $AP,$ when the first term $a$ and the common difference $d$ are given as follows: $a = 10, d = 10.$

If the sum of first $7$ terms of an $AP$ is $49$ and that of $17$ terms is $289,$ find the sum of first $n$ terms.

$A$ contract on a construction job specifies a penalty for delay of completion beyond a certain date as follows: ₹ $200$ for the first day,₹ $250$ for the second day,₹ $300$ for the third day,etc. The penalty for each succeeding day is ₹ $50$ more than for the preceding day. How much money does the contractor have to pay as a penalty if he has delayed the work by $30$ days?

In the following $APs,$ find the missing terms in the boxes $5, \square, \square, 9 \frac{1}{2}$