Chapter 7.9, Problem 7.76PP

How would each of the following change the rate of the reaction shown here?
$\text{2NO}\left(\text{g}\right){\text{+2H}}_{\text{2}}\left(g\right)\to {\text{N}}_{\text{2}}\left(g\right){\text{+2H}}_{\text{2}}\text{O}\left(\text{g}\right)$

a. adding some NO(g)
b. decreasing the temperature
c. removing some ${\text{H}}_{\text{2}}\left(\text{g}\right)$
d. adding a catalyst