In 30 seconds, a mountain biker goes up a 125-foot hill, then down 78 feet, and then back up a 32-foot hill. How much higher or lower from the start of the trail is the biker after 30 seconds?

The product of two negative rational numbers is always zero sometimes zero never zero

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

Average acceleration: i have no idea how to do this.