Please answer number 11!! i need help

Find the third,fifth and seventh term sequence described by each rule a(n)=n+1

△cde maps to △stu with the transformations (x, y) arrowright (x − 2, y − 2) arrowright (3x, 3y) arrowright (x, −y). if cd = a + 1, de = 2a − 1, st = 2b + 3 and tu = b + 6, find the values of a and b. the value of a is and the value of b is .

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?