The staircase has treads that are 10 inches deep with 7 inch high risers. If the staircase needs to reach a total height of 8 feet, 2 inches. How much floor space needs to be allowed for the staircase?

140 inches

Step-by-step explanation:

The design of the staircase treads is 10 inches deep and 7 inches rise.

The total height of the staircase is 8 feet and 2 inches.

Present the height of staircase in inches as;

1 foot = 12 inches

8 ft=?

Apply cross-product as (8*12)/1 =96 inches

Total height in inches of the staircase= 96+2 = 98 inches

Finding the number of times the tread's height fits in the total height will be;

98/7 =14 times

The floor space for the staircase will thus be; 10*14 =140 inches

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.