Solve the equation -y^2-3y when y=4

Step-by-step explanation:

when y = 4 becomes

-16 - 12 = -28

(or)

when y=4 becomes

16 -12 = 4

Two answers if the question is  understood in 2 different  ways

hope it you

step-by-step explanation:

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