ok, the formula to working out the VOLUME of any pyramid is:

1/3 x area of base x height (perpendicular height)

so if we substitue the numbers in...

we will have ((5 x 5) / 3) x 14

= 116.66666 (recurring) cm^3

now to find the total surface area...

that means, adding up the areas of the square base and the 4 other triangles around it

the area of the base = 5x5 = 25

the area of each triangle = (14 x 5)/2 = 35

so 4 triangles = 4 x 35 = 140

140 + 25 = 165

so total surface area = 165cm^2