Find the height of the parallelepiped if its volume is 30 cm3 and the base area is 10 cm2.

The task is given: a parallelepiped whose volume (we denote it by V) is 30 cm³, and the base area (we denote it by S) is 10 cm². It is required to find the height (let us denote it by H) of the given parallelepiped.
In order to solve the problem, we will use the following formula for determining the volume of a parallelepiped: V = S * H. Substituting the data into the above formula, we have: 30 cm³ = 10 cm² * H. Consider the obtained equality as an equation for the unknown H and solve it using rule: “To find an unknown factor, you need to divide the product by a known factor.” We have: H = (30 cm³): (10 cm²) = (30: 10) cm = 3 cm.
Answer: 3 cm.