Chapter 4 - An Introduction to Functions - 4-5 Writing a Function Rule - Practice and Problem-Solving Exercises - Page 265: 16

h=21t+40 The height of helicopter after 45 seconds will be 985 ft

h is the height of a helicopter, and it increases by 21 feet everytime for each second and since the helicopter started the climb at 40 feet above the ground, the function rule should be h=21t+40 To find height after 45 seconds plug it in the equation. h=21t+40 h=21(45)+40 h=945+40 h=985 ft