1. For each sequence given below, find to and 55. E}1}',51.153. b} 31. 23. 15. 2. Consider the series -4 +1+ 6 +... + 36 a} Calculate the number of terms in the series. b) CalcuIate the sum of the series. 3. An open: house has 39 seats in the first row, 53 seats in the second row, 5;! seats in the third row, and so on. The last row has 235 seats. a) HOW many seats are in the 1o1 row? b} How many rows of seats are there in the opera house? c) What is the total number of seats in the opera house? 4. A catering company has 6 orders during its first month. For each month after, the company has double the number of orders from the previous month. a) Write the sequence of the number of orders for the first 5 months. b) Hourr many orders in total does the company have in its rst year