Explanation

To find the number: 15 ÷ 0.20 = 75

So, 15 is 20% of 75.

Explanation

Collinear points are points that lie on the same straight line.

Example: Points A, B, and C on a ruler are collinear if they form a straight path.

Explanation

Explanation

Inductive reasoning involves observing patterns or examples and forming a generalized conclusion.

It moves from specific cases to a general rule.

Explanation

Irrational numbers cannot be expressed as fractions and have infinite non-repeating decimals.

Examples include √2, π, which do not terminate or repeat in decimal form.

Explanation

The greatest 5-digit number is 99999.

Adding 2 gives 99999 + 2 = 100001, which is 1 more than the smallest 6-digit number (100000).

Explanation

The set-builder form A = {x | x ∈ ℤ ∧ x² = 25} means x is an integer whose square is 25.

The integers satisfying this are x = -5 and x = 5, so A = {-5, 5}.

Explanation

Divide 4 ÷ 18 = 0.222..., which is a recurring decimal.

It can also be written as 0.overline{2} indicating the digit 2 repeats.

Explanation

If U is the universal set and B = {2,4,6,8}, then U – B gives the complement of B.

So, U – B = {1,3,5,7}, which are elements in U not in B.

Explanation

The union (∪) of sets includes all unique elements from both sets.

From X = {3,4,5,6} and Y = {1,2,3,8}, their union is {1,2,3,4,5,6,8}.