Devin started the work shown to solve for the unknown angle measures.

8x – 1 + 9x – 6 = 180
17x – 7 = 180
17x = 187
What are the measures of angles Q and R?

m∠Q =
°

m∠R =
°

F. a fair coin is thrown in the air four times. if the coin lands with the head up on the first three tosses, what is the probability that the coin will land with the head up on the fourth toss? a. 0 b. 1/16 c. 1/8 d. 1/2