Write a 2-digit number that has twice as big ten digit as it has unit digit.

Which expression is equivalent to √ -80?

What are the values of m∠abc, m∠cbf, m∠abd and m∠dbe in the given figure? explain or show your work?

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer