At a fast-food joint, 3 cheeseburgers and 5 medium shakes cost $14.31. at the same fast-food joint, 7 cheeseburgers and 2 medium shakes cost $15.41. what is the cost of a cheeseburger? what is the cost of a medium shake?
show me the steps to solve the problem!

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,

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.