Explanation

Disjoint sets have no elements in common.

Therefore, their intersection is the null set (∅).

Explanation

The set of all natural numbers, together with zer,o is the set of whole numbers

Explanation

An improper fraction is a fraction in which the numerator is greater than the denominator. Let's evaluate each fraction in the list:

1. $frac{15}{7}$: 15 is greater than 7, so this fraction is improper.
2. $frac{14}{9}$: 14 is greater than 9, which is also an improper fraction.
3. $frac{13}{7}$: 13 is greater than 7, so this is also an improper fraction.
4. $frac{12}{8}$: 12 is greater than 8, so this is also an improper fraction.

Since all four fractions have numerators greater than their denominators, all of them are improper fractions:

Explanation

What is the next number in this sequence: 1, 3, 5, 7, 11?

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RY 13-01-2023

Explanation

Given:

5y > 35

2y < 20

Solving the inequalities:

5y > 35 → y > 7

2y < 20 → y < 10

Since y is an even integer and 7 < y < 10, the only even integer in this range is 8.

Explanation

The set of positive integers is commonly referred to as the natural numbers or counting numbers

It is denoted by the symbol N or Z+.

This set includes all whole numbers greater than zero: 1, 2, 3, and so on. 

Explanation

When 9 is multiplied by any number, the sum of the digits in the product is always 9.

Examples:

- 9 × 1 = 9 (sum of digits: 9)

- 9 × 2 = 18 (sum of digits: 1+8 = 9)

- 9 × 3 = 27 (sum of digits: 2+7 = 9)

- 9 × 4 = 36 (sum of digits: 3+6 = 9)

And so on. This property holds true for all multiples of 9.

Explanation

One minute: 60 seconds

One hour: 60 minutes

One hour: 3600 seconds

Explanation

 Any number that can be exactly divided by 2 is called as an even number. Even numbers always end up with the last digit as 0, 2, 4, 6.

Explanation

Natural numbers are positive integers starting from 1 and include numbers like 2, 4, and 9.

Therefore, all the given options (9, 4, 2) are indeed natural numbers.