Shortly after Rutherford discovered the proton in 1911, Moseley reorganized the periodic table using and eliminated some of the discrepancies found in Mendeleev's periodic table that was organized by atomic mass. A) atomic number B) energy levels C) valence electrons D) average atomic mass number​

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

the answer is 48m^2!

step-by-step explanation:

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.