How do u find the missing number of x and y

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

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%