Plz help I don’t know what to do it and I need a explanation for it

A function is defined as an equation in which no x value has two y values.  You can find the answer to this via the vertical line test.  If you move a pencil across a graph and it does not touch the graph at two points, then it is a function.  Utilizing this logic, the correct answer is yes, this is a function.

Step-by-step explanation:

answer: 12   they all have at least 28 days

step-by-step explanation: haha

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15