The area of a parallelogram is the base times the height so:
A=bh, in this case:
A=hx
x=A/h, we are told that A=120mm^2 and h=10mm so
x=120mm^2/10mm
x=12mm
The answer is 1/27.
4/9 divided by 1/27 is 12
3+2x=5x-9
minus 2x both sies
3=3x-9
add 9 to both sides
12=3x
divide both sides by 3
4=x
