The length of each leg of an isosceles right triangle is 40.9cm . Find the length mod the penthouse to the nearest tenth

What is the value of x in the diagram below?

Can someone me do math because i am having a breakdown rn because i don’t get it

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line