Rate of change

If y varies directly as x, and y is 180 when x is n and y is n when x is 5, what is the value of n?

30

If y varies directly as x, and y is 12 when x is 1.2, what is the constant of variation for this relation?

b

If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when x is 11?

b

The average rate of change of g(x) between x = 4 and x = 7 is mc003-1.jpg. Which statement must be true?

c

The cost of soup, s, varies directly with the number of cans, c. When c is 4, the cost is $3. Which graph represents the cost of the soup?

c

Which expression can be used to determine the average rate of change in f(x) over the interval mc001-1.jpg?

d

Which relation is a direct variation that contains the ordered pair (2, 7)?

d

Maria created a graph of B(t), the temperature over time. For the interval between t = 3 and t = 7, the average rate of change in her graph of B(t) is 8. Which statement must be true?

The temperature was 32 degrees higher when t = 7 than when t = 3.

What is the average rate of change in f(x) over the interval [4,13]?

a