What is the greatest common factor (GCF) of 28 and 42?

14

Step-by-step explanation:

The common factors of 28 and 42 are 14, 7, 2, 1, intersecting the two sets above. In the intersection factors of 28 ∩ factors of 42 the greatest element is 14. Therefore, the greatest common factor of 28 and 42 is 14.

i think the answer is b

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.