The answer is 25.9. To find it add the other sides (21.5 + 32.4 + 28.7 = 82.6) Then take the perimeter (108.5) and subtract (108.5 - 82.6 = 25.9)
The recursive formula of the explicit rule an = (n + 1)² is 
where a1 = 4
<h3>How to determine the recursive formula?</h3>
The explicit formula is given as:
an = (n + 1)²
This means that:
a1 = (1 + 1)² = 4
a₂ = (2 + 1)² = 9
a₃ = (3 + 1)² = 16
Rewrite as:
a₂ = 4 + 2 * 2 + 1 = 9
a₃ = 9 + 2 * 3 + 1 = 16
Substitute a₂ = 9
a₃ = a₂ + 2 * 3 + 1 = 16
Express 2 as 3 - 1
a₃ = a₃₋₁ + 2 * 3 + 1
Express 3 as n
Evaluate the product
Hence, the recursive formula of the explicit rule an = (n + 1)² is where a1 = 4
Read more about explicit rules at:
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The amount after 2 years is $2,295.
Given that,
- The invested amount is $1,240.
- The rate of interest is 8%.
- The number of years is 2 × 4 = 8
Based on the above information, the amount after 2 years is
Future value = Present value ×(1 + rate of interest)^number of years
= $1,240 × (1 + 0.08)^8
= $1,240 × 1.08^8
= $2,295
Therefore we can conclude that the amount after 2 years is $2,295.
Learn more: brainly.com/question/18051939
Answer:
dont you have the answer beside it? Or is that an x?
Step-by-step explanation:
x³+2x²-6x-12=x²•(x+2)-6(x+2)=(x+2)•(x²-6)
