Asked by Amber

A brick staircase has a total of 16 steps The bottom step requires 112 bricks. Each successive step requires 4 fewer bricks than the prior one. How many bricks are required to build the staircase?

Answers

Answered by Reiny
you are finding the sum of 16 terms of an arithmetic sequence where
a = 112
d = -4
n = 16

S<sub>16</sub> = (16/2)[2(16) + 15(-4) ]
= .....
Answered by g
-224
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