Answer:
30
Step-by-step explanation:
We can say that the length of line segment Y'Z' will increase by a scale factor of 2.
To calculate h evaluate inside the square root before taking the square root
h = √(7² - 3.5²) = √(49 - 12.25) = √36.75 = 6.06 ( to 2 dec. places)
-6.86666666667 this is the answer for your question
