9. John Goodman weighs 250 pounds, so he decides to go on a diet. At the end of the first week, he weighs 240. Then at the end of the second week, he weighs 230.

Question

9. John Goodman weighs 250 pounds, so he decides to go on a diet.  At the end of the first week, he weighs 240.  Then at the end of the second week, he weighs 230.  
Fill in the blanks of the arithmetic formula [ A(n) = d + a1(n – 1) ] for this scenario.

A(n)  = _____  +  _____  (10– 1 )		
How much will he weigh at the end of week 12? ___

Steve · Answer

Actually, the usual formula is written as A(n) = a1 + (n – 1)d You know a1)250) and d(-10), so plug them in and set n=12