A rectangle has vertices A(1, 6), B(6, 6), C(6, 3) and D(1, 3). What is the perimeter of the rectangle?. Single choice. 16 units
12 units
15 units
18 units

you have orange juice on wednesday. (idk why this is the answer)

step-by-step explanation:

the radius is 2 times the diameter.

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81