Can anyone write a function rule for the following situations?

Question

1.) Amy sells tote ags at a craft fair for a day. She pays $50 to rent a booth. The materials and labor cost on each tote bag is $3.50. Her expenses for the day depend on how many tote bags (t) she sells. Write your rule starting with f(t)=

2.)What are the domain and range of the following numbers, is the relation a function?
(7,-2),(8,-2),(-5,7),(-9,1)

Answer 1

1) f(t) = 50 + 3.5(t)

2) Domain = {7,8,-5,-9}

Range = {-2,-2,7,1}

No, it is not a function.

Answer 2

1) If "t" is the number of tote bags that can be made with the material she bough, and E(t) is her total expenses on a given day, then E(t) = 50 + 3.5t.

2) So far as we can tell from just 4 points, this is a function. It doesn't matter that taking 7 and 8 as input both give -2 as output. The important thing is that a given input value gets one and only one output value. The domain would be {-9, -5, 7, 8} and the range would be {-2, 1, 7}

Answer 3

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Answer 4

2.Yes,it is a function because the first numbers don't repeat.The domains are 7,8,-5,-9.The range is -2,-2,7,and1.