Answer:100Step-by-step explanation: Given : [tex]a=20[/tex] To Find : the value of expression 5a.Solution :We are given the value of 'a' i.e. a=20Now to find the value of given expression 5a ⇒[tex]5a[/tex] put a = 20 in the equation ⇒[tex]5*20[/tex] ⇒[tex]100[/tex] ⇒[tex]5a = 100[/tex] Thus , The value of expression 5a when a = 20 is 100