*cough* Should've taken notes *cough*
The cost of 1 apple is 0.75, because the dot is halfway between 0.5 and 1.
The cost of 3 apples is 2.25, because the dot is halfway between 2 and 2.5.
Hope my answer helped u :)
As of 2018 there have been 3 weather and climate disaster totalling or exceeding 1 billion dollars.
Graph it on Desmos, you'll find a match.