NEED HELP URGENTLY .

I assumed that the unit of measure is ft.

Front+back:

S1=2×(4×3.5/2)=4×3.5=14ft²

2 sides+base:

S2=3×(9×4)=9×12=108ft²

Total area: 14+108=122ft²

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

step-by-step explanation: