What problems happened in the south (Texas) with reconstruction?

What is the simplified form of 7 √x • 7 √x • 7 √x • 7 √x?

Jessica is a custodian at oracle arena. she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate. at this rate how many sqaures meters can she wax per hour

See attachment below and find the equivalent of tan(∠qsr)