Which statement is true about f(x)=square root x

Find x & pleassse me !

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Without multiplying, tell which product is larger and why. 5 × 1/3 or 5 × 2/3 a)5 × 1/3 because 1/3 is less than 2/3 b) 5 × 1/3 because 1/3 is greater than 2/3 c) 5 × 2/3 because 1/3 is less than 23 d) 5 × 23 because 1/3 is greater than 2/3