Write an explicit formula for the sequence 4,-1,-6,-11,-16 then find a14

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)