these comfortably. I recommend practicing these starting with both the right and left hand.
These first 4 measures have the slashed doubles displaces by a 16th note. Repeat each measure until you feel comfortable before you move on to the next and then play them in order, one after the other. If you have trouble starting with the doubles, play a measure of straight 16th notes to orient yourself and then play the intended measures.
Practice these consistently and you will see an improvement in your double stroke rolls.