Find f(-4),f(-3.1),f(1.2)and f (2.8)for f(x)=x

The answer is f(-4) = -4 ,f(-3.1) = -3.1 ,  f(1.2) = 1.2 , f(2.8) = 2.8

Step-by-step explanation:

   We have to find out f(-4) , f(-3.1) , f(1.2) , f(2.8)

    For the condition f(x) = x

    This means that whatever we give input to the function the value to the

     function is equal to the value input this means that

    f (input) = output

    Here output = input

    f ( input ) = input

    ∵ f(-4) = -4

       f(-3.1) = -3.1

       f(1.2) = 1.2

       f(2.8) = 2.8

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour