The graph below shows the cost of pens based on the number of pens in a pack. what would be the cost of one pen?
a. $1.50
b. $2.30
c. $6.00
d. $13.50
(worth 10 points! )

A. $1.50

Step-by-step explanation:

Based on the graph, the cost of the pencils is the same regardless of the number bought, so the equation is linear.  You can find the rate, or cost per pencil, by first using two points:

(5, 7.5) and (3, 4.5)

Slope formula:

In order to find the unit rate, you divide the numerator by the denominator to get the price per pencil:

3 ÷ 2 = $1.50 per pencil

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,

9x