Question

SIXTH GRADE MATH HELP
MEDAL+FAN!

The cost of 4 kilograms of cheese is 50 dollars. What is an equation to show this, but in function notation?

Answer 1

Let's call the cost y and weight x.

Answer 2

Sure, ok.

Answer 3

$12.5 per kilogram or \[1.25\times 10^{1}\]

Answer 4

$50 corresponds to 4 kg
That means there must be a number that when you multiply by 4 you get 50.
Let that number be k. k is the price of cheese per kg.
1 kg: y = k * 1
2 kg: y = k * 2

Answer 5

per kilogram

Answer 6

3 kg: y = k * 3
4 kg: y = k * 4
For x kilograms: y = k * x

Answer 7

Now let's look at 4 kg:
y = k * 4, but the cost is 50, so we have
50 = k * 4
We can solve for k, the cost per kilogram, and get
k = 12.5

Answer 8

Now that we know what the cost per kg is, we can rewrite our function using the cost:
y = 12.5x
Since we want function notation, we finally write: f(x) = 12.5x

Answer 9

None of my answer selections have anything to do with the number 12.5. Here are my selections:
Cost(50)=4
Cost(4)=50

Answer 10

@mathstudent55

Answer 11

I think it's going to be the cost(4)=50.

The cost depends on the number of cheeses...4. The cost is 50. I'm going to go with that one. Thanks anyway lol

Answer 12

What are the other choices?

Answer 13

Oh, I see. With only those two choices, you are correct.
Cost is a function of weight.
cost(4) = 50 makes sense.