Answer:
16 + 3n
Step-by-step explanation:
a = 19 ; common difference = 22 - 19 = 3
a(n) = a + (n -1 ) *d
= 19 + (n-1)*3
= 19 + 3n - 3
= 16 + 3n
Expand the squared binomials:


Then





Answer:
Step-by-step explanation:
where's the parallelogram?
2nd one is the answer to it.