How many flat faces does this solid figure have?

Find the value of x, given that the surface area is 154 cm²

Diagram shows a shape of combined with a hemisphere and a cylinder.
FInd the surface area of the shape.
  $\pi\ =\ \frac{22}{7}$  

The object is consist a prism and a half cone.
Find the surface area of the object.

 $\pi=\frac{22}{7}$  

The diagram shows a prism contained water to a height 10 cm, calculate the volume of water needed to fill up the prism.

The diagram shows a pyramid with rectangular base.

The height of pyramid is equal to the length of PQ.

Calculate the volume.

A metal ball with radius 6 cm is melted down to form some small ball with radius 1.5 cm.
Calculate the number of small balls formed.
 $\pi\ =\ \frac{22}{7}$