The number pyramid program

Question

A number pattern is shown below.

Row 2 8 10

Row 3 15 17 19

Row 4 24 26 28 30

Row 5 35 37 39 41 43

A. Whats the difference between the last number in Row 6 and the first number in Row 6?

B. Write an equation that can be used to find d, the difference between the last number and the first number, for any row r.

C. What is the first number in row 11? What is the last number in row 11? Explan.

D. What is the number in Row 1? Explain.

Answer 1

difference is 10 for answer A

d=2r-2 for answer B where r represents the number of the row

1st # is 143 and last number is 163 for answer C

3 is the number because 3x1=3 and there is only one seat in row 1. Then row 2 is 2x4, row 3 is 3x5, etc.