Kathy jumped 16
1
2
ft at the long jump event. Nadia jumped
18
1
8
ft at the long jump. How much farther did Nadia jump than Kathy?

i got 10.28 but that rounds up to 10.3

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,

x:       y:  

-1         4

0         4

1         6

2         18

3         20