Wouldn't you add them all together? for example:
$35 x 12 = $ 420 ( that's the reminding 12 months)
$420 + 75 = $495 (for the connection fee) than work out the 6 months worth
$25 x 6 = $150 (For the 6 months) than plus $495 + 150 = $645.
I see what I did. I didn't realise you add the first answer to get the second.

Which option identifies how kevin should proceed in the following scenario? four years ago kevin designed an mp3 player for young children. now that technology has changed, he would like to update his design to ensure that it encompasses cutting-edge techniques. by creating a third-angle projection of his ideas by designing an isometric projection of his new ideas by referring to past designs and illustrations of his original model by conferring with engineers who have improved upon similar devices