Donnie is 7 years old. Donnie's age is 3 years less than half of Ana's age. The relationship between their ages can be modeled by the equation 12−3=7, where x is Ana's age. How old is Ana?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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?

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.