Explanation

To evaluate the expression, follow the order of operations:

Multiply 3 and 3: 3 × 3 = 9

Divide 9 by 3: 9/3 = 3

Add 3 and 3: 3 + 3 = 6

Explanation

Successive refers to things that occur in sequence, one after the other, without interruption.

Successive means یکے بعد دیگرے

Following immediately one after the other means فوری طور پر ایک کے بعد ایک کے بعد

Explanation

The conjugate acid of water (H₂O) is H₃O⁺ (hydronium ion).

When water acts as a base, it accepts a proton (H⁺) and forms H₃O⁺.

Explanation

Pythagoras was an ancient Greek mathematician and philosopher.

He is famous for the Pythagorean Theorem, which relates to right-angled triangles.

Explanation

In indirect speech, the exclamatory sentence is changed into a statement.

The present tense ("is") changes to past tense ("was").

The phrase "What a lovely dress it is!" is reported as "She exclaimed that it was a lovely dress."

Explanation

The correct preposition with "concerned" in this context is "about", meaning to be worried or aware of something.

Example: We should be concerned about climate change and its effects.

Explanation

To simplify the expression, follow the rules of exponents:

(x⁴)³ = x^(4×3) = x¹²

Now, divide x¹² by x⁻⁴:

x¹² ÷ x⁻⁴ = x¹² × x⁴ (since dividing by x⁻⁴ is the same as multiplying by x⁴)

= x^(12+4)

= x¹⁶

Explanation

Scuba tanks contain a mixture of nitrogen (N₂) and oxygen (O₂), commonly called compressed air or nitrox.

Nitrogen prevents oxygen toxicity at high pressures, which can occur in deep-sea diving.

Explanation

When comparing two things, we usually use better, but since "this is the" is present, we need the superlative form (best).

Good is the positive form.

Explanation

The absolute value | -12 | represents the distance of -12 from zero, which is always positive.

Therefore, | -12 | = 12.