3sisters are each 2 years apart in age. the youngest sister is emily, the middle sister is samantha and the oldest sister is lauren. together their combined ages are 42. how old is each sister?

a. define the variable(s).
b. write an equation for this situation using one variable.
c. solve the equation for the ages of the 3 sisters.

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,