If 44 = 4, 66 = 6 and 99 = 9 then 57 = _____?

Explanation
The pattern appears to be that the number on the right side of the equation is the last digit of the number on the left side . The last digit of 57 is 7 .

Explanation
Step 1: Calculate the expression -3 + 12 = 9 Step 2: Compare the result to the options Since √81 = 9 (because 9² = 81), the correct answer is √81 .

Explanation
2a³ - a³ = (2-1)a³ = 1a³ = a³ This is because when you subtract a³ from 2a³ , you are essentially subtracting 1a³ from 2a³ , leaving you with 1a³ , which simplifies to a³ .

Explanation
Step 1: Calculate the division 0.3/0.1 = 3 Step 2: Multiply the result by 0.3 3 × 0.3 = 0.9

Explanation
The secant of an angle θ is defined as 1/cos(θ). For θ = 0, cos(0) = 1 . sec(0) = 1/cos(0) = 1/1 = 1 .

Explanation
The cosine of π radians (or 180 degrees) is -1 .

Explanation
The cosine of 0 degrees is 1 .

Explanation
π (pi) is approximately 3.14159 . The value of Pi (π) is the ratio of the circumference of a circle to its diameter.

Explanation
Step 1: Recall the definition of set difference The set difference A - B is the set of elements that are in A but not in B. Step 2: Calculate A - A A = {1,2,3,4} A - A = {} (since every element in A is also in A, the difference is the empty set )

Explanation
The distributive law for sets states that A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C).