Question 4667
In the 9 x 12 room, there is a floor space of 9*12 feet or 3 x 4 yards (3 feet to a yard)
3*4 = 12 square yards 
12 sq. yards * 18.50 per square yard = $222

Area is found by multiplying height by width:
Two walls are 9' high x 9' wide and two walls are 9'high x 12' wide

(2*9*9) + (2*9*12) = 162+216 = 378 square feet  
350 square feet are in one gallon so you will need to purchase two gallons = $32.00 dollars

Total for room #1 = $254

Room 2
Same process

Walls: (2*9*14)+(2*9*16) = 540 sq. feet (2 gallons of paint = $32)
Floors: 14 * 16 = 224 square feet or 24.8 square yards (9 square feet in one yard) Round up to 25 square yards * 18.5 = $462.50

Total for room two = $494.50

Room 3

walls: (2*9*12)+(2*9*14) = 468 square feet - 2 gallons of paint = $32
carpet: (12*14=168 square feet or 18.67 square yards)  Round up to 19 yards.
19*18.50 = $351.50
Total for room 3 = $383.50

Total for house = $383.50 + $462.50 + $254.00 = $1100.