Please help look at picture and round to the nearest tenth

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

What fraction is equivalent to 0.46464646··· a. 46⁄99 b. 46⁄999 c. 46⁄100 d. 23⁄50