Given: A(2,1), B(0,5), C(-1,2), AB and BC, mpab = 1/2, mpbc = -1/3, midpoint of AB = (1,3), midpoint pf BC = (-1/2, 7/2). Find standard form equation of line perpendicular to BC through the midpoint .
Use the formula m = y-y1/ x-x1

A. -x - 3y = 10
B. -x + 2y = 5
C. -x - 3y = -10

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)

europa2433

europa2433

step-by-step explanation:

i dont know sorry

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.