Write a formula to describe the sequence

1, 0.9, 0.8, 0.7, 0.6, 0.5 ...

A. A (n) = 1 - A (n - 1)

B. A (n) = n - 0.1 (n - 1)

C. A (n) = 1 - 0.1n

D. A (n) = 1 - 0.1 (n - 1)

d

Step-by-step explanation:

A (n) = 1 - 0.1 (n-1)

A (1) = 1 - 0.1 * (1-1) = 1 - 0.1*0 = 1

A (2) = 1 - 0.1 * (2-1) = 1 - 0.1*1 = 1 - 0.1 = 0.9

A (3) = 1 - 0.1 (3-1) = 1 - 0.1*2 = 1-0.2=0.8

Method:

A (1) = 1

D = A (2) - A (1) = 0.9 - 1 = - 0.1

A (n) = A (1) + (n-1) * d = 1 + (n-1) * (-0.1)

= 1 - 0.1 (n - 1)