8. What is the mean of this set of data? 13,7, 20, 13, 12
a. 13
b. 12.6
c. 12.8
d. 12.7

a) 13

Step-by-step explanation:

the answer is A 13

Step-by-step explanation:

i think it is c hope that

hello there!

i believe the answer is

(cot2+1)/sec2=cot2

    csc2/sec2=cot2

  (1/sin2)/(1/cos2)=cot2

  (1/sin2)(cos2/1)=cot2

  cos2/sin2=cot2

  (1/tan2)=cot2

  (cot2)=(cot2)

hope this !

hyperz ^_^