Question

Why did the speaker ask his mother not to worry and cry for him?​

Answer 1

The number system in most common use today is the Arabic system. It was first developed by the Hindus and was used as early as the 3rd century BC. The introduction of the symbol 0, used to indicate the positional value of digits was very important.

Answer 2

Combination reaction may occur between two elements, two compounds, or between a compound and an element.