Question

As part of an Earth Science project, Erin tracked the amount of rain fall for 4 weeks. She started tracking after finding some initial data on the year's rainfall to date:


Week Rainfall
1 5.5
2 8
3 10.5
4 13

If the linear function representing the amount of rainfall each week is f(w) = 2.5w + 3, what does the 3 represent in this function?
The amount of rainfall in week 0
The week that Erin collected data
The amount of total rainfall
The amount the rainfall increased each week

Answer 1

It'd be the initial rainfall, so, in other words, Week 0's rainfall total.
For every number you can do this;
(2.5 +3) = 5.5
2.5(2) + 3 = 8
2.5(3) + 3 = 10.5
2.5(4) + 3 = 13