HELP, QUICK!!! 19 POINTS up for the ANSWER

On a road trip, a family drives 200 miles the first day and 350 miles per day each remaining day. How many additional days, d, will they travel to reach a distance of 1,600 miles?

Part A
Write an equation to represent this situation.
_______+_______d=_________ (The number of underscores isn't for the number of digits I just put them to show an empty space.)

Part B
Solve the equation. How many total days does the family travel?

(please answer each part of the question and label your answer. Thanks!)