Area of a Triangle Formula:
A=(1/2)base*height
A=54
base=12
Fill in
54=(1/2)*12*h
Solve for h
A pure substance that is made of only one kind of atom is called an element.
An element is a pure substance, which means it is made up of only ONE kind of atom.
I believe the answer is
26
sorry if wrong
if not an answer choice then 168.