A small staircase is made so that the horizontal piece of each step 10 inches long and 25 inches wide. Each step is 5 inches above the previous one. What is the surface area of this staircase?

1125 in²  

Step-by-step explanatio1D

Assume that the staircase is three steps high, as in the diagram.

Each tread has a surface area of

10 in × 25 in = 250 in²

Each riser has a surface area of

5 in × 25 in = 125 in²

There are three treads and three risers, so the total surface area is

3 × 250 in² + 3 × 125 in² = 750 in² + 375 in² = 1125 in²

i dont know sorry

step-by-step explanation:

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column