Circumference = 2 * π * radius = 2 * 3.14 * 7 ≈ 43.96 cm.

Area = π * r^2 = π * 7^2 = 154 (using π ≈ 22/7).

Let the number be x. Then, x/3 = 5, so x = 5 × 3 = 15.

Let the original number be x. Then, x + 0.2x = 120, which gives 1.2x = 120, so x = 100.

Net change = (1.2x * 0.8) - x = 0.96x, which is a decrease of 4%.

Any number multiplied by 0 is always 0.

Perimeter = 2 * (length + width) = 2 * (10 + 5) = 30 units.

Using the Pythagorean theorem, hypotenuse = √(3² + 4²) = √(9 + 16) = √25 = 5 cm.

Distance = speed * time = 60 km/h * 2.5 h = 150 km.

Odds in favor = probability of event / (1 - probability of event) = 0.25 / 0.75 = 1:3.

Area = π * radius² = 3.14 * 3² = 3.14 * 9 = 28.26 cm².

The next prime number after 7 is 11.

The product of the roots of ax² + bx + c = 0 is c/a. Here, product = 6/1 = 6.

2^3 = 2 * 2 * 2 = 8.

7! = 7 * 6 * 5 * 4 * 3 * 2 * 1 = 5040.

9 squared (9^2) = 9 * 9 = 81.

2^3 = 8, 3^2 = 9, so 8 + 9 - 4 = 13. The correct answer is 7.

The square root of 144 is 12, since 12 * 12 = 144.