In this problem, use the general expressions for left and right sums,

left$-$hand sum $=f(t_0)t+f(t_1)t+$cdots$+f(t_{n-1})t$

and

right$-$hand sum $=f(t_1)t+f(t_2)t+$cdots$+f(t_n)t$

and the following table:

$\backslash$table$[[t,0,6,12,18,24],[f(t),40,36,34,33,32]]$

A$.$ If we use $n=4$ subdivisions, fill in the values:

B$.$ Find the left and right sums using $n=4$

left sum $=$

right sum $=$

C$.$ If we use $n=2$ subdivisions, fill in the values:

$\backslash$table$[[t=,],[t_0=,$;$t_1=$