x= 8 feet (answer : A)
Step-by-step explanation:
hello :
the perimeter is : P= 2(x+y) y : the length x : the width
P=40 and y = 12 calculate : x
2(x+12) =40
divid by 2 : x+12 =20
x=20-12
x= 8 feet
they are simplified
step-by-step explanation:
hope it you
sin(7pi/6 - pi/3)
= sin(7pi/6 - 2pi/6)
= sin(5pi/6)
= sin(pi - pi/6)
= sin(pi/6)
= 1/2
sin 7pi/6 - sin pi/3
= sin (pi + pi/6) - sin pi/3
= -sin pi/6 - sin pi/3
= -1/2 - sqrt(3)/2
= -(1+sqrt(3))2