Will give brainliest to right answer
consider u = {x|x is a positive integer greater than 1}.

which is an empty set?

{x|x ∈ u and is prime}
{x|x ∈ u and 2x is prime}
{x|x ∈ u and can be written as a fraction}
{x|x ∈ u and 2x can be written as a fraction}

a² + b²= c²

24² + 7² = c²

c= 25

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)