what is the number of risers required and their unit rise when building a stair with a total rise of…

what is the number of risers required and their unit rise when building a stair with a total rise of 7-7\?\n11 risers, each 7-1/2\ high\n12 risers, each 7\ high\n13 risers, each 7\ high\n14 risers, each 7-1/4\ high

what is the number of risers required and their unit rise when building a stair with a total rise of 7-7\?\n11 risers, each 7-1/2\ high\n12 risers, each 7\ high\n13 risers, each 7\ high\n14 risers, each 7-1/4\ high

Answer

Explanation:

Step1: Convert total - rise to inches

First, convert 7'-7" to inches. 1 foot = 12 inches, so 7 feet = 7×12 = 84 inches. Then 7'-7" = 84 + 7=91 inches.

Step2: Check each option

Option 1:

For 11 risers, each 7 - 1/2" high. 7 - 1/2" = 7.5 inches. The total rise is 11×7.5 = 82.5 inches.

Option 2:

For 12 risers, each 7" high. The total rise is 12×7 = 84 inches.

Option 3:

For 13 risers, each 7" high. The total rise is 13×7 = 91 inches.

Option 4:

For 14 risers, each 7 - 1/4" high. 7 - 1/4" = 7.25 inches. The total rise is 14×7.25 = 101.5 inches.

Answer:

13 risers, each 7" high