2
-3
Find the least common denominator of
x2 - 4x – 21
and
x² - 4

LCD = (x - 7)(x + 3)(x + 2)(x - 2)

Step-by-step explanation:

First, we factor each polynomial.

x^2 - 4x - 21 = (x - 7)(x + 3)

x^2 - 4 = (x + 2)(x - 2)

There are 4 different factors and none are in common, so the LCD is the product of all the factors.

LCD = (x - 7)(x + 3)(x + 2)(x - 2)

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

the answer is b