Can you please help me on my homework and create the graphs ?

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

1. list three scientific reasons cockroaches may fly.