Question

A farmer hears a weather report saying that temperatures will be decreasing approximately 5 degrees every hour for the next 4 hours. What signed number represents the total change in temperature expected over the next 4 hours?

Answer 1

if it decreases how 5 degrees every hour for 4 hours you'll get

1-hour=5
2-hours=5+5
3-hours=5+5+5
4-hours=....