What are the correct answers to this geometry problem?

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

In exponential growth functions, the base of the exponent must be greater than 1,how would the function change if the base of the exponent were 1? how would the fiction change if the base of the exponent were between 0and 1

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5