Charmaine made 4 identical necklaces, each having beads and a pendant. the total cost of the beads and pendants for all 4 necklaces was $19.60. if the beads cost a total of $12.80, how much did each pendant cost?

For a problem like this, you'll want to break it down ...

Total cost = $19.60.
Cost of beads = $12.80.
Cost of pendant = ? 

We know that there are 4 necklaces. Each necklace has one pendant, so we have 5 pendants total. Therefore, your solution should look something like this ...

Total cost = Cost of beads - cost of pendant 
$19.60 = 12.80 - 4x       <- x is the variable representing the price for a single                                               pendant. 

6.80 = 4x                       <- Subtract 12.80 from both sides. 

x = 1.70                         <- Divide both sides by 4, and find your final answer.

x = 1.70; therfore, each pendant costs $1.70.