Answer:
d is correct
Step-by-step explanation:because u have to read closely and put the information to the answers
Try this solution (see the attachment), note:
1. the word 'ctgx' means 'cotangens x'; 2. this equation has roots not for all the real number 'r', it is shown in the 2-d line of the answer; 3. the answer is marked with red colour.
Answer: 20%
Step-by-step explanation: the decimal is 0.2 and that make the percentage 20%