When
1. $I \approx 20$
2. $I \approx 23$
3. $I \approx 21$
4. $I \approx 24$
5. $I \approx 22$
is the graph of a function $f$, use rectangles to
estimate the definite integral
$I = \int_0^{10} |f(x)|dx$
by subdividing $[0, 10]$ into 10 equal subintervals and taking right endpoints of these
subintervals.
