beirut lebanon

2015 .
Top 50.
D1: Beirut 15
2024121-11.
.
().
. . ...
.
JC J.C.STAFF () JK JB Jet Brains JS.

2015 .
Top 50.
D1: Beirut 15
2024121-11.
.
().
. . ...
.
JC J.C.STAFF () JK JB Jet Brains JS.
A ladder leans against a wall, reaching a height of 15 feet. The base of the ladder is 9 feet from the wall. Find the length of the ladder.
#### 2, 3Question: An ornithologist observes that the number of a certain bird species in a reserve follows a quadratic polynomial $ p(t) $, where $ t $ is the year. Given $ p(2020) = 50 $, $ p(2021) = 65 $, and $ p(2022) = 86 $, find $ p(2023) $.
Subtracting consecutive equations to eliminate $ c $:
For $ n = 2 $: $ 4A + 2B + C = 19 $,
For $ n = 3 $: $ 9A + 3B + C = 28 $.
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