30 points!
the work of a student to find the dimensions of a rectangle of area 8 + 12x and width 4 is shown below:
step 1: 8 + 12x
step 2: 4(4) + 4(8x)
step 3: 4(4 + 8x)
step 4: dimensions of the rectangle are 4 and 4 + 8x
in which step did the student first make an error and what is the correct step? step 2; 4(2) + 4x(2)
step 2; 4(2) + 4(3x)
step 3; 4 + (4 + 8x)
step 3; 4 + (4 ⋅ 8x)

answer: sensy

step-by-step explanation:

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

80 the answer is 80

step-by-step explanation:

sasasadaassasasasa opk ok you know