For this case we have:
By trigonometric property we have:

Where:

Substituting:

Clearing x we have:

Thus, the equation is: 
Answer:

F(x)=3x^2-5 when x=-11
f(-11)=3(-11)^2-5
f(-11)=-33^2-5
f(-11)=1089-5
f(-11)= 1084
Hope this could help!
The approximation to estimate will be 0.2498
Answer:
( intransitive) To tend steadily upward or downward. ...
( transitive) To form with a slope; to give an oblique or slanting direction to; to incline or slant. ...
( colloquial, usually followed by a preposition)
Step-by-step explanation: