What is the exact number for an irrational

Use sigma notation to represent the following series for 9 terms.

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?