A brick staircase has a total of 17 steps The bottom step requires 131 bricks. Each successive step requires 5 less bricks than the prior one. How many bricks are required to build the staircase?

1547 bricks are required to build the staircase.

Step-by-step explanation:

We are given:

Number of bricks in the first step, = 131

Number of bricks in the second step, = 131 - 5 = 126

Number of bricks in the third step, = 126 - 5 = 121

Sequence become:

131, 126, 121, .....

These are in arithmetic progression where a = 131 and d (common difference) = -5

To calculate the sum of an AP, we use the formula:

where,

n = number of terms = 17

Putting values in above equation, we get:

Hence, 1547 bricks are required to build the staircase.

2 and 1.

step-by-step explanation:

plug in each answer. 0 doesn't work, 1 does. so does 2. 4 doesn't:

0 = 1 is not true.

2 = 2 is true.

4 = 4 is true.

8 = 16 is not true.

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