One inch is equivalent to 2.54 centimeters. how many inches are there in 50.8 centimeters.

Which expression is not a polynomial?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.