Explanation

If a sum becomes 3 times in x years, and you're using compound interest, then:

• In 2x years, it becomes $3\times 3=9$ time

• In 3x years, it becomes $3\times 3\times 3=27$ time

So, if the sum triples in 4 years, it becomes 27 times in $4\times 3=12$ years.

Explanation

Oghab 44 or Eagle 44 is an Iranian underground airbase unveiled in February 2023.

It is the first tactical and secret airbase for the army's air force

That accommodates the fighters, bombers, and Iranian UAVs.

Explanation

A hydrophone is an instrument designed to detect and record sound underwater.

It's essentially the underwater equivalent of a microphone and is commonly used in:

• Marine biology (e.g., studying whale calls or dolphin clicks)

• Submarine and naval operations (e.g., detecting other submarines or ships)

• Environmental monitoring (e.g., measuring underwater noise pollution)

• Underwater research (e.g., studying seismic activity or underwater volcanic eruptions)

Explanation

The velocity of sound is calculated using the formula:

Velocity=Frequency×Wavelength

Given:

Frequency = 300 Hz

Wavelength = 4 ft

Velocity=300×4=1200 ft/sec

Explanation

We use the compound interest installment formula to find equal annual payments:

$$P = frac{x}{(1 + r)^1} + frac{x}{(1 + r)^2}$$

Where:

• $P=₹1025$ (debt)

• $r = 5$

• $x$ = annual payment

• Time = 2 years

Substitute values:

​ $$1025 = frac{x}{1.05} + frac{x}{1.1025}$$ $$1025 = x left( frac{1}{1.05} + frac{1}{1.1025} right) = x (0.9524 + 0.9070) = x (1.8594)$$
$$x = frac{1025}{1.8594} ≈ 551.25$$

Explanation

Musaylimah bin Habīb later known as Musaylimah Al-Kazzab (The liar)

Musayliama the Liar  d.632, from the Banu Hanifa tribe

Masallamah al Kazaab claimed to be a prophet during the lifetime of Muhammad (PBUH).

Masallamah al Kazaab was a leader during the Ridda wars.

ND15-10-2023