7. Are the ordered pairs below an arithmetic sequence or geometric sequence?
(1,55)
(2, 45)
(3, 35)
(4, 25)

8. Using the formula: f(n) = f(1) + d(n-1), find f(9) for the ordered pairs
in #7.

8. Arithmetic Progression

9.

Step-by-step explanation:

Given

Solving (8): Arithmetic or Geometric

We start by checking if it is arithmetic by checking for common difference (d).

This gives:

Because the common difference is equal, then it is an arithmetic progression

Solving (8):

To find f(9), we substitute 9 for n

We need to solve for f(8); substitute 8 for n

We need to solve for f(7); substitute 7 for n

We need to solve for f(6); substitute 6 for n

We need to solve for f(5); substitute 6 for n

From the function, f(4) = 25 and f(1) = 55.

So:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

asdsad

step-by-step explanation: