Since s and t are directly proportional, it means if something is done to one of them, it should be done to the other too to get the symmetrical answer.
If that didn't make sense, here's an example:
Say s=3 and t=9
If s is divided by 3, t must also be divided by 3
In the end, s=1 and t=3
Now, see if you can try it for yourself!
I hope this helped
p is inversely proportional to q^2.
^(thats what is given to us)^
so, if q=3, then q^2=9.
if we would want to find out the constant between the first q^2 and the second, we would do 64 divided by 9.
once u get that, you would times that to 19, as p and q^2 are inversely proportional.
i hope this helps