When was the first mask made

The first mask was made in 7000 BC. It was used primarily for rituals and ceremonies and where typically made of leather or wood. Keep in mind, these where the first masks that our modern generation has been able to find and preserve, masks could have been made earlier than this but detirriorated over time.

However, the first modern surgical masks where made in the early 1960s and replaced a more primitive method of cloth masks.

I hope I have helped! :)

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

missouri compromise of 1820 which prohibited slavery