Find the missing ? Explanation need it

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Parks is wearing several rubber bracelets one third of the bracelets are tie-dye 1/6 are blue and 1/3 of the remainder are camouflage if parks wears 2 camouflage bracelets how many bracelets does he have on

Can any one me with the answers to these questions asap?