To do it without a calculator you would first want to get the denominator to be 100.
To do this you would have to multiply both the top and bottom by 4
So now you have 72/100. You would then divide 72 by 100. To do this you simply move the decimal left two place, and you would get .72
Approximately 84 inches will equal to 33 cm.
Biconditionals are statements that work both ways.
Some examples:
If it rains, I go out, and if I go out, it must be raining.
This can be stated concisely in mathematical terms as
I go out IF AND ONLY IF it rains.
So looking at the given statements, only the last two work both ways, namely:
If the sun rises in the east, then it is morning, and if it is morning, the sun rises in the east.
Victoria will play outside if and only if the weather is nice.