Explanation

Let’s analyze each option under the assumption that a and b are integers:

a⁷ → Square of an integer → Always an integer

b* → Ambiguous; if it means b raised to some power (like a^b or b^a), then:

If b = 2 and a = -1, then b^a = 2⁻¹ = 0.5, not an integer

So, this is not necessarily an integer

a * b → Product of two integers → Always an integer

2a – 5b → Linear combination of integers → Always an integer

Explanation

Let's calculate:

√(9) = 3

6 + 3 = 9

√(9) = 3

22 + 3 = 25

√(25) = 5

Explanation

Direct speech: He said to me, "Why are you sad today?"

Indirect speech rules:

Said to → changes to asked (since it's a question).

Are → was (present to past).

Today → that day (change in time expression).

He asked me why I was so sad that day.

Explanation

Originally published: 1979

Explanation

Given:

(3z + 4z + 5z) / 2 = 36

Combine like terms:

12z / 2 = 36

6z = 36

z = 36 / 6

z = 6

Explanation

Let's calculate:

Regular wages for 40 hours = 40 * Rs. 30 = Rs. 1200

Total wages received = Rs. 1680

Overtime wages = Rs. 1680 - Rs. 1200 = Rs. 480

Overtime wage rate = 2 * Rs. 30 = Rs. 60/hour

Number of overtime hours = Overtime wages / Overtime wage rate

= Rs. 480 / Rs. 60

= 8 hours

Explanation

Laboratory means علم کیمیا کے امتحان کا مکان یا کارخانہ

Explanation

A keyboard is a physical input device, so it is considered hardware.

It allows the user to interact with the computer by typing commands or data.

Explanation

Scissor means کینچی

Explanation

A constellation is a group of stars forming a pattern, located outside our solar system.

Asteroids, satellites, and comets are all within the solar system.