Is this a true statement X^2=1 if and only if x=1 or x=-1

In the diagram of circle a what is m

At the county fair, the baxter family bought 6 hot dogs and 4 juice drinks for $12.90. the farley family bought 3 hot dogs and 4 juice drinks for $8.55. find the price of a hot dog and the price of a juice drink.

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss