Exploring Arithmetic Sequences with Dr. Ihrig

What type of formula is being discussed in the video?

• Logarithmic formula

• Exponential formula

• Recursive formula

• Quadratic formula

Which of the following subscripts indicates a recursive formula?

• n - 1

• n + 1

• n + 2

• n

Why can’t the correct answer be option B or D?

• They have n + 1 as the subscript

• They have n + 2 as the subscript

• They have n as the subscript

• They have n - 1 as the subscript

What is the first term (a sub 1) in the given sequence?

• 19

• 7

• 11

• 4

What is the common difference in the sequence?

• 2

• 4

• 5

• 3

What is the first step in deriving the explicit formula?

• Substitute the value of n

• Copy the explicit formula from the formula sheet

• Erase the letter D

• Simplify the equation

What value is substituted for a sub 1 in the explicit formula?

• 4

• 11

• 7

• 19

What is the result of distributing 4 in the explicit formula?

• 4N and -4

• 4N and +4

• 4N and +7

• 4N and -7

How do you verify the simplified explicit formula using a graphing calculator?

• By checking if the graph is a hyperbola

• By checking if the graph is a parabola

• By checking if the graph is a straight line

• By checking if the graph is a circle

What should you do when you see an arithmetic sequence in a problem?

• Guess the answer

• Ignore the sequence

• Open the formula sheet and use the calculator

• Use a different formula