If s(x) = 2 – x2 and t(x) = 3x, which value is equivalent to (s )? a. -439 b. -141 c. 153 d. 443

Option (a) is correct.

Step-by-step explanation:

 Given : and

We have to find the value of  (s t)(-7) and choose the correct option from the given options.

Consider the given function and

and we have to find the value of (s t)(x) at x = -7

We first find the value of (st)(x) that is s(t(x))

Thus,

Simplify,

We get, For x = -7 , we have,

Simplify, we have,

Thus,  

ok

step-by-step explanation:

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