What is the final step to prove that Sn 1 + 2 + 3 + ... + n = n(n+1)/2? a. Verify that Sn is valid for n = 1 c. Assume that Sn is valid for n = k b. Show that Sn is valid for n = k d. Prove that Sn is valid for n = k + 1

r(0,90)(x,y) . t(-5,0)

last option

step-by-step explanation:

∆def to ∆d"e"f"

- rotate 90 counterclockwise degrees

- then translated 5 to the left (x --> x - 5)

answer is the last option

chicken chicken chicken

step-by-step explanation: