Can you please tell me which one it is?? its okay if not

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?

Mike wants to make meatloaf. his recipe uses a total of 8 pounds of meat. if he uses a 3 to 1 ratio of beef to pork, how much pork will he use? enter your answer as a mixed number in simplest terms.