TOPIC :- Avian Worlds.
Q.1. Fill in the blanks:-
1) Wter birds like ducks and swans have _____________ feet.
2) Vultures, eagles and owls are called ____________ as they eats small animals.
3) Chisel - shaped break help a _________________ to make hole in a tree trunk.
Please answer my question friend fast it's too much urgent please answer fast and correctly.
Answers
The number of trees in consecutive rows increase by 1. So, it this is an Arithmetic progression, where d = 1, a = trees in first row = 1 and n = number of rows = 25. We have to find out number of trees in 25 rows? Using well known formula, i.e, formula of sum of nth term of Arithmetic progression ::
\Large\underline{\boxed{\bf{\red{S_{n} = \dfrac{n}{2}\Big[2a + \big(n - 1\big)d\Big]}}}}
S
n
=
2
n
[2a+(n−1)d]
Where, Sn denotes sum of nth terms, n denotes number of terms, a denotes first term and d denotes common difference.
Let's solve it!!
\:
\underline{\sf{\bigstar\:Putting\:all\:known\:values\::-}}
★Puttingallknownvalues:−
\begin{gathered}\\ \longrightarrow \:\sf S_{25} = \dfrac{25}{2}\Big[\big(2\big)\big(1\big) + \big(25 - 1\big)\big(1\big)\Big] \end{gathered}
⟶S
25
=
2
25
[(2)(1)+(25−1)(1)]
\begin{gathered}\\ \longrightarrow \:\sf S_{25} = \dfrac{25}{2}\Big[\big(2\:\times\:1\big) + \big(24\:\times\:1\big)\Big] \end{gathered}
⟶S
25
=
2
25
[(2×1)+(24×1)]
\begin{gathered}\\ \longrightarrow \:\sf S_{25} = \dfrac{25}{2}\Big[2 + 24\Big] \end{gathered}
⟶S
25
=
2
25
[2+24]
\begin{gathered}\\ \longrightarrow \:\sf S_{25} = \dfrac{25}{\cancel{2}}\:\times\:\cancel{26}\end{gathered}
⟶S
25
=
2
25
×
26
\begin{gathered}\\ \longrightarrow \:\sf S_{25} = 25\:\times\:13\end{gathered}
⟶S
25
=25×13
\begin{gathered}\\ \longrightarrow \:\boxed{\bf {\purple{S_{25} = 325}}}\:\orange{\bigstar}\end{gathered}
⟶
S
25
=325
★
Answer:
1) Water birds like ducks and swans have ___webbed___ feet.
2) Vultures, eagles and owls are called ____scavanger_ as they eat small animals.
3) Chisel-shaped break help a ___woodpecker__ to make a hole in a tree trunk.
Explanation:
thank you!Hope it helps!