Express 0.4 as a fraction in simplest form.

If the diameter of a sphere is 12 units, what is its volume?

If a trapezoid has one base of length 6 units, another base of length 10 units, and a height of 8 units, what is its area?

If a triangle has sides of lengths 7, 24, and 25 units, what type of triangle is it?

If 2552​ of a number is 18, what is the number?

The perimeter of a regular hexagon is 30 units. What is the length of each side?

The sum of four consecutive integers is 34. What are the integers?

If a circle has an arc of 60∘60∘ and a radius of 8 units, what is the length of the arc?

The sum of three consecutive odd numbers is 45. What are the numbers?

What is the sum of the angles in a regular heptagon?