(b) ABC is the triangle shown below, and D is a point on the line BC. The
lengths of the lines are as shown in the diagram. Find DC], i. e. the
length of the line DC. (NOTE: the triangle ABC is not a right-angled
triangle.)

2 over 5 and 4 over 15

don’t know last one sorry

step-by-step explanation:

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

the answer on e2020 was d.