Simplify: (1/2k)(4k) + 12 = if i put choices you guys would just guess

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?

Solve the triangle. a = 21°, c = 105°, c = 5