3) If (Tn) is A. S where Tn = 3n+
2, then the arithmetic mean
between T5,T11 is

3 qrs + 3/2 xy hope this : /

step-by-step explanation:

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: