A dentist polls his patients and finds that 83 percent brush their teeth at least twice a day, 47 percent floss daily, and
19 percent brush at least twice a day and floss daily. What is the probability that a patient flosses daily, given that he
or she brushes at least twice a day? Round to the nearest percent.
16%
23%
40%
57%

answer: 2/4

step-by-step explanation:

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,

if you was gonna solve for a, a is a   < -12