Explanation

The set L = {x, y, z} has 3 elements: x, y, z.

The proper subsets are:

1. {x}

2. {y}

3. {z}

4. {x, y}

5. {x, z}

6. {y, z}

7. {}

There are 7 proper subsets.

Explanation

Markup = Principal × Rate × Time

= 8000 × 7/100 × 5

= 8000 × 0.07 × 5

= 8000 × 0.35

= 2800

Explanation

8.0560 has 5 significant figures: 8, 0, 5, 6, and the final 0 (after decimal) is also significant.

Trailing zeros after a decimal point are always significant.

Explanation

A perfect square is a number that is the square of an integer.

Among the options:

√625 = 25

√289 = 17

√441 = 21

√325 ≈ 18.03 → Not an integer

Explanation

Liter (L) is the standard unit of capacity or volume in the metric system.

It is commonly used to measure liquids like water, milk, or fuel.