x + y ≡ 4 + 3 ≡ 7 (mod 7), which is equivalent to 0.

11 mod 7 = 4, so x could be 11.

If x ≤ 4, then 2x ≤ 8 is always true.

This is a perfect square: (x + 1)^2 = 0 => x = -1.

Factoring gives (x - 2)(x - 3) = 0, so x = 2 or x = 3.

This is a perfect square: (x - 3)^2 = 0, so x = 3.

x^3 = 8 => x = 2

Taking the cube root of both sides, x = 8^(1/3) = 2.

Taking the fourth root, x = 81^(1/4) = 3.

From y + 3 > 0, we get y > -3. Since y < 2, the only true statement is y > -3.

cos^(-1)(1/2) = π/3, since cos(π/3) = 1/2.

The derivative of cos^(-1)(x) is dy/dx = -1/√(1-x^2).

The derivative of y = cos^(-1)(x) is dy/dx = -1/√(1-x^2).

The derivative of cos^(-1)(x) is dy/dx = -1/√(1-x^2).

The derivative of y = sin^(-1)(x) is dy/dx = 1/√(1-x^2).

By definition, if y = sin^(-1)(x), then x = sin(y).

The derivative of y = sin^(-1)(x) is dy/dx = 1/sqrt(1-x^2).

The second derivative d^2y/dx^2 = -1/√(1-x^2)^3.

The range of y = tan^(-1)(x) is (-π/2, π/2).

The first derivative dy/dx = 1/(1+x^2). The second derivative d^2y/dx^2 = -2/(1+x^2)^2.

Y is the sister of Z, making her A's daughter as well.

The answer should have 1 decimal place, as 0.3 has the least decimal places.

You are 2 km in the north-west direction from point A.

Point A is to the north-west of your current location.

Point A is southwest from your current position.

The distance from point A is 5 km in the north-east direction, calculated using the Pythagorean theorem.

The final position is 5 km in the north-west direction from point A.

You are 5 km away in the south-west direction from point A.

Using the Pythagorean theorem, the distance from A is 5 miles northeast.

Using the Pythagorean theorem, the distance from A is 5 miles in the north-east direction.