Yis directly proportional to x, and y=56 when x=7. find the value of y when x=4.

What is the smallest integer n such that n\sqrt{2} is greater than 20

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?