Answer:
a₂₁ = 638
Step-by-step explanation:
substitute n = 21 into the explicit formula
a₂₁ = - 2 + 32(21 - 1) = - 2 + 32(20) = - 2 + 640 = 638
B?
<em>4/2 </em>is the ratio and the diameter is <em>2</em>
<em>4/2 </em>is a fraction and <em>2 </em>is when you divide 4/2. Correct me if I am wrong.
