Last month ,dory biked 11 times as many miles as early. together they biked a title of 156 miles. how many miles did dory bike last month?

143

because the equation would be 11x+x=156. so if you add like terms it would be 12x=156. then 156/12 is 13. 13 is how many miles Early biked.
so dory biked 11 times as many miles, so you would solve 13(Early's miles) times 11(Dory's miles).  13x11=143 
so dory biked 143 miles last month

The answer would be 24mm

31 is prime. and it’s prime factorization is just 31.