Enter the unknown value that makes this statement true: 20% of ? is 40. ​

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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%

Acollege student takes out a $7500 loan from a bank. what will the balance of the loan be after one year(assuming the student has not made any payments yet) a. if bank charges 3.8% interest each year ?