Question

What is the length of $AD$?

• A. $17$
• B. $15$
• C. $7$
• D. $1$

Answer 1

The correct option is B

$15$

Explanation for the correct option:

Option (B):

Find the length of $AD$ by finding the difference between the two points.

So, subtract the number under $A$ from the number $D$.

From the given diagram, the value of $A$ is $-7$ and the value of $D$ is $8$.

Thus, the length of $AD$ is as follows:

$\begin{array}{rcl}D-A& =& 8-\left(-7\right)\\ & \Rightarrow & D-A=8+7\\ & \Rightarrow & D-A=15\end{array}$

Therefore, the length of $AD$ is $15$.

Hence, option (B) is correct.