Please help Write the series using summation notation.

4. - 10 + 2 + 14 + 26 + 38 + 50 + 62 + 74

5. 6+13+32+69+

6. - 5/8 + 10/11 + 20/16 + 40/23

Asif spent $745.10 on 13 new file cabinets for his office. small file cabinets cost $43.50 and large file cabinets cost $65.95. write and solve a system of equations to find the number of small cabinets and large cabinets he purchased. determine if each statement is true or false. 1. he purchased 5 small cabinets. true or false 2. he purchased 7 large cabinets. true or false 3. he spent $527.60 on large cabinets. true or false