Answer please! Find the answer to both questions

Step-by-step explanation:

Given sequence:

We can see apart from the second term all terms are 2nd degree trinomial so it is not a GP.

Let's find the difference: to determine if it is a AP:

As we see the difference is common and it confirms the sequence is AP.

First term is

Common difference is

nth term is:

answer is c

step-by-step explanation:

81/12=324/x

x=48

m∠abd = m∠dbc

step-by-step explanation:

given : ab bisects ∠dbc

as we know that bisection means ab divides   ∠dbc   in two equal angles named as   ∠dba and   ∠abc

so, m∠abd = m∠dbc  

because ab bisects ∠dbc.

hence , the first statement m∠abd = m∠dbc is true.