Can somebody help me with 5-10

Which is the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4

Ineed with number 6 , explain how to get 1978

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?