X^2=16
x= 4 OR x=-4
The picture attached below is your answer because it’s between 4 and -4.
The total number of bulbs the landscape contractor planted is 29,928 so the answer is D.
SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Explain the formula to use
Using the cosine rule which states that:

STEP 2: Write the given sides

STEP 3: Find the value of z

Hence, the indicated length is 4.0