If s (x) = 2 - x2 and t (x) = 3x, which value is equivalent to (s circle t) (negative 7) ?

-439

-141

153

443

-439

Step-by-step explanation:

a on edge

-439

Step-by-step explanation:

(s circle t) (negative 7) is a notation for a compound function.

A compound function is a function that has as an argument another function.

Another notation for this compound function is s (t (-7)), that is, the result of the function t (-7) is the value that will be used in the function s (x).

So, first we calculate the value of t (-7):

t (x) = 3x

t (-7) = 3 * (-7) = - 21

Now, we apply this value for s (x):

s (x) = 2 - x2

s (t (-7)) = s (-21) = 2 - (-21) ^2 = 2 - 441 = - 439