Algebra 2 help please!

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

Find the 6th term of the expansion of (2p - 3q)11. a. -7,185,024p4q7 c. -7,185p4q7 b. -7,185,024p6q5 d. -7,185p6q5 select the best answer from the choices provided a b c d

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.