The variables y and x have a proportional relationship, and y = 28 when x = 21. What is the value of x when y = 42?

x = 14

x = 1823

x = 3112

x = 56

Karianne and lucius are analyzing a linear function on a graph. karianne says that unit rate is equal to rate of change, but that slope is calculated differently. lucius says that unit rate, rate of change, and slope are calculated the same way. who is correct? explain your answer.

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?