Answer:
(r + s)[tex]\sqrt{t}[/tex]
Step-by-step explanation:
Given
r[tex]\sqrt{t}[/tex] + s[tex]\sqrt{t}[/tex] ← factor out [tex]\sqrt{t}[/tex] from each term
= [tex]\sqrt{t}[/tex](r + s)
= (r + s)[tex]\sqrt{t}[/tex]
