What is the formula for the following arithmetic sequence? 12, 6, 0, -6, an = 12 + (-6)(n - 1) an = 12 + 6(n - 1) an = -6 + 12(n - 1) an = 6 + 12(n - 1)

an= 12 + (-6)(n-1)

Step-by-step explanation:

you should find two values: a1 and d

a1= first number =12

d= a number of the sequence mines the number of the sequence before the one you chose = 0-6 = -6

a1+(n-1)d= 12-6(n-1)

perimeter of the base times height

step-by-step explanation:

mark has $52

hope this !