IL MARK YOU BRILLIANT PLEASE I REALLY NEED IT Solve the following proportions. Express the answer as fractions/mixed numbers. x/4 = 40/60

13/58 = y/36

42/46 = 50/m

78/n = 56/62

17/18 = 21/x

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points