Two circles are concentric and have radii of 15 and 25 respectively if two arcs are formed by the same central angle which of the fallowing are possible arc lengths

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

Ithink i know it but i want to be sure so can you me out ?