Exploring Accumulations of Change Practice Test

A particle’s velocity is $v(t)=2$ for $0\le t\le 1$ and $v(t)=-2$ for $1\le t\le 3$. What is displacement on $0,3$?

A bank balance changes at rate $B'(t)=-5$ dollars/day for $0\le t\le 7$. What is $B(7)-B(0)$?