Question

NO NEED TO SOLVE JUST determine if its geometric series or geometric sequence or arithmetic seriesA fireplace contains 46 bricks along its bottom row. If each row above decreases by 4 bricks, how many bricks are on the 12th row?

Answer 1

46,42,....
a =46
d = -4
12th row means n= 12
tn = a+(n-1)d
tn =46+(11)*(-4) = 46 - 44 = 2 bricks

Answer 2

You're decreasing the number of bricks by a set amount each time (in this case 4)


So this is an arithmetic sequence.