Question 4665
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  
Room 2
Same process

Walls: (2*9*14)+(2*9*16) = 540 sq. feet 
Room 3

walls: (2*9*12)+(2*9*14) = 468 square feet 
Total for house = 468+540+378 = 1386 square feet

Divide by 350 square feet (the amount covered by each gallon)=3.96
Round up to 4 gallons

TOTAL
$16 (the cost of paint) *4 = $64.