Adding and subtracting polynomials

(-3x² - 9x + 5) - ( -2x²- 4x + 7)​

Add or subtract polynomial : –12qr? +13rq?

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

How to do this , and can some one explain