A class ofnchildren sit in a circle. The teacher walks around the outside of the circle and pats everykth child onthe head. Find and prove a necessary and sufficient condition onnandkforevery child to receive a pat on the head.

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

5 + 8 +7 + 4 + 0 +1 = 25

step-by-step explanation:

the answer to this would be 5x^3-6x^2-24 over 3x^2

hope this if needed hmu

x< -17/2 hope this