Answer:
I guess d is the answer . cause the sum of a number (a number added to something) represented by a variable is added to twelve
I can’t really see the questions that well, what does it say?
Using the three trigonometric functions can be used to calculate unknown side lengths and angle in a right-angle triangle only.
But, if ever you we're given to find a non right-angle triangle, you will have to use sine rule or cosine rule.
I'm not entirely sure what you are asking but the equation would be r/220=t.