6.299 or 6.3 depending on how it wants you to round
16cm / 2.54 cm per in = 6.3 inches
check the picture below.
so it has a base of 18x18 and a height of that much.

5z^2 + 16
a coefficient is a number multiplied by a variable (a letter). so there is only ONE coefficient in this expression and it is 5.
Answer:
h = 12 in
Step-by-step explanation:
To find the height, divide the volume by the base:
2880 in^3
height: ------------------ = 12 in
240 in