Help me on how to do this

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

Cherie measures and records the lengths and sizes of the same style of a sandal found at a shoe store. which equation can be used to determine the approximate shoe size, s, for a foot length of x inches? s = x – 2 s = 2x – 10 s = x + 6 s = 2x + 4

Aline that intersects one of two parallel lines intersects the other also always sometimes never