What is the nth term for this linear sequence 28,25,22,19,16

Josephine has a great garden with and area of 2x2 + x - 6 square feet

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

Mr.zimmerman invested $25,000 in an account that draws 1.4 interest, compouneded annually. what is the total value of the account after 15 years