Consider the sequence:

3, 8, 13, 18, 23,

represents a particular any term and represents just previous term.

Step-by-step explanation:

In the given recursive formula,

represents

and represents just its previous term.

To find , first five terms are given there. We need to find its previous terms

Similarly,

Similarly,

Thus is the answer.

$9.41

step-by-step explanation:

m∠a is 90°

m∠b is 40°