The sum of two four digit numbers is a five digit number

Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !

What’s a definition for a polygon inscribed in a sphere ?

p(subject lied | negative test result)equals nothing (round to three decimal places as needed.) find the probability of selecting a subject with a negative test result, given that the subject lied. upper p left parenthesis negative test result | subject lied right parenthesisequals nothing (round to three decimal places as needed.) compare the two values. are they equal?