if the graph is NOT a linear function, then the two variables are NOT directly proportional
B)c=48b is the correct answer to the problem
He spent the same amount on each bolt size...so we need to find the lowest common multiple of 0.15, 0.20, and 0.30....and that would be 0.60
so he spent 0.60 on each bolt
Maybe it’s acceleration but I’m not sure cause to be honest it could be any of them but I picked acceleration because from 0 all the way to up is accelerating so yeah I really hope that helps and deepest apologies if my answer is wrong.