30 is the fixed cost and 2.40 is the variable cost (per dog)
so read really carefully

This is asking for factored form.  We can take the factored form and double distribute aka FOIL to see if that algebra is equivalent to what was given.

Also, the original can be put into Y1 and each of the algebra in the answers can be put into Y2, then compare Y1 and Y2 to  check your answer.

Above is a piecewise function which means part of the graph is linear (5x) and part of the graph is a parabola (x^2 + 4)>

A closed circle means it includes the value so a closed circle would be used for the top expression of 5x and an open circle would be used for x^2 + 4.

As x=3 is included in the top equation which is a closed circle when x = 3 and y = 15 (when we substitute x = 3 into 5x)

With x >3, it is an open circle at x =3…when we substitute x = 3 into x^2 + 4 we get 13.

This relative frequency asks how many of the males prefer skiing.
How many males?
How many of them prefer skiing?
Create a fraction of these two numbers: (The number who prefer skiing)/(#of males)