Algebra Math sequence

Question

Complete the sentences about each sequence. Type your answer in the space provided. Write fractions as decimals.

The sequence  10, 9.5, 9.0, 8.5,... has a common difference of 

The sequence 200, 100, 50, 25, ..has a common ratio of  

Answer 1

first sequencer has a common difference of - 1/2 = -0.5

2nd sequence has a common ratio of 1/2 = 0.5

(definitely a half baked question)

Answer 2

For arithmetic sequence subtract 1st value from 2nd

For geometric sequence divide 2nd value by 1st value