What are the answers for questions 3& 4? explanations if possible !

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

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?