một hộp đựng 3 bi đỏ và 7 bi xanh. lấy ngẫu nhiên từ hộp ra một bi. nếu bi lấy ra màu đỏ thì bỏ vào hộp một bi xanh. nếu lấy bi màu xanh thì bỏ vào một bi đỏ, sâu đó lấy tiếp ra 1 bi.

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

yes

yes yes yes

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.