Y varies directly proportion with x. if x =5 then y=12 thus find the value of x when y=84

35

Step-by-step explanation:

If two things are directly proportional it means that their ratio is costant:

K (proportionality costant) : y/x

we know that when x=5 y=12

so:

K=5/12 (2.4)

we know that when x has a certain value, y=84

so:

2.4 = 84/x

we find the x to be 35

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