Select the postulate about two planes.
postulate 1: a line contains at least two points.
postulate 1a: a plane contains at least three points not all on one line.
postulate 1b: space contains at least four points not all on one plane.
postulate 2: through any two different points, exactly one line exists.
postulate 3: through any three points that are not one line, exactly one plane exists.
postulate 4: if two points lie in a plane, the line containing them lies in that plane.
postulate 5: if two planes intersect, then their intersection is a line.

54

step-by-step explanation:

6x9

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.

8

step-by-step explanation: