Fred and his sons, Tom and Bill, built a recreation room in their basement. Fred worked twice as many hours as Tom, and Bill worked 10 hours more than Tom. Altogether the three of them worked 94 hours. How many hours did Fred work?

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,

sounds & other waves originate from any vibrating object