Please help me now please

A = 30    i hope this helps!   :)

Step-by-step explanation:

a straight line is 180 degrees

we are given two angle measurements

measure of angle A = 6x - 18

measure of angle B = 14x + 38

so now we need to combine the equations together and have them equal 180 degrees

6x - 18 + 14x + 38 = 180

combine like terms

first the x values   20x - 18 + 38 = 180

now the regular numbers   20x + 20 = 180

subtract 20 from both sides of the equation   20x = 160

then divide both sides by 20   x = 8

now that we have the value of x, we can plug it into the equation for angle A

lets see the equation for angle A again

A = 6x - 18

plug in the x value to 6x

A = 48 - 18

combine like terms

A = 30

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