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There are 18 cameras that will be necessary to cover the entire store, the correct option is D.
What is the unitary method?
A unitary method is a method by which we can find the value of one unit from the value of many units and the value of many units from the value of one unit.
Given
Marina wants to install security cameras in her store, which has dimensions 48 feet by 48 feet.
Each camera can view an area of approximately 128 ft2, with a viewing area shaped like a right triangle.
The distance between grid lines is 4 feet.
From the information given, the area of the store roof will be:
= 48 × 48 = 2304 ft²
The area viewed by the camera = 112.5ft²
The number of cameras that will be necessary to cover the entire store is;
[tex]= \dfrac{2304}{128}\\\\= 18[/tex]
Hence, there are 18 cameras that will be necessary to cover the entire store.
To know more about the unitary method click the link given below.
https://brainly.com/question/9337121
