What is the nth term of this sequence 12 22 32 42 52

Sandy is ordering bread rolls for her party,she wants 3/5 of the rolls to be whole wheat. what other factions can represent part of the rolls that will be whole wheat? shade the models to show your work.

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years