Explanation

Given the equations:

1. 7x - 4y = 10

2. 2x + 3y = 65

Let's solve them using elimination or substitution. Multiplying equation 1 by 3 and equation 2 by 4 gives us a way to eliminate y:

1. 21x - 12y = 30

2. 8x + 12y = 260

Adding both equations:

29x = 290

x = 290 / 29

x = 10

Explanation

Frogs typically have 26 chromosomes in their body cells.

The number of chromosomes is species-specific and helps in maintaining genetic stability.

Explanation

The phrase “life is a broken-winged bird” directly compares life to a bird without using “like” or “as.”

This is a metaphor, where one thing is said to be another to show similarity.

Explanation

Chemical changes involve a transformation where new substances with different properties are created.

It often through reactions like combustion, rusting, or digestion.

Explanation

Escape velocity is the minimum speed a spacecraft needs to completely overcome Earth's gravitational pull without further propulsion.

For Earth, this velocity is approximately 11.2 km/s.

Explanation

Crocus means ایک قسم کا پھول

Crocus means a small yellow, white, or purple spring flower.

Explanation

Isobars are atoms of different elements that have the same mass number but different atomic numbers.

Example: Argon-40 and Calcium-40 both have mass number 40 but different atomic numbers.

Explanation

Oxygen has 8 protons and typically 8 neutrons, giving it a mass number of 16.

Mass number = Number of protons + Number of neutrons.

Explanation

The idiom "flogging a dead horse" means trying to continue with something that has no hope of success.

In this context, it suggests further appeals are pointless and a waste of time.

Explanation

The correct phrasing requires "Was the microwave" to form a proper question about the invention of the microwave.

It follows the structure of asking about the invention of a specific item in the past.