The answer to 1. Is Reflection. The rigid motion show is called a Reflection
Look at the picture i have attached. 8 tally marks are four lines with one crossed over plus three more separate lines
Answer:
15
Step-by-step explanation:
Using the formular, Sn = n/2(2a + (n - 1)d)
where, n = 6: Sn = 6/2( -20 + 5(3)) = 3(15 - 20)
∴ Sn = 15