You want to buy a calculator that is at most 115 dollars. you already have 30 dollars saved and you make 7.50 dollars a hour. how many hours would you have to do to buy a calculator?

you need to work 12 hours to buy the calculator

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