At a particular restaurant, of all customers order an appetizer and of all customers order dessert. If of all customers order both an appetizer and dessert, what is the probability a randomly selected customer orders an appetizer or dessert or both? Write your answer as a decimal (not as a percentage).

image for option 4

step-by-step explanation:

i just know the internet

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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.  

130 degrees. i have no other way to explain