The first four terms of a sequence are shown below.

8, 5, 2, -1

which of the following functions best defines this sequence?

f(1) = 8, f(n + 1) = f(n) + 3; for n _ 1

f(1) = 8, f(n + 1) = f(n) - 5; for n _ 1

f(1) = 8, f(n + 1) = f(n) + 5; for n _ 1

f(1) = 8, f(n + 1) = f(n) - 3; for n _ 1

which of the following statements best describes the effect of replacing the graph of y = f(x) with the graph of y = f(x) + 20?

the graph of y = f(x) will shift left 20 units.

the graph of y = f(x) will shift down 20 units.

the graph of y = f(x) will shift up 20 units.

the graph of y = f(x) will shift right 20 units.

every week annie plants 2 saplings in her garden. the function below shows the total number of saplings f(w) in her garden after w weeks.

f(w) = 2w + 3

which statement best describes the y-intercept of the graph of the function?

it is equal to 3 and represents the original number of saplings in annie's garden.

it is equal to 2 and represents the original number of saplings in annie's garden.

it is equal to 3 and represents the number of saplings in annie's garden at the end of the first week.

it is equal to 5 and represents the number of saplings in annie's garden at the end of the first week.