In the function y = 0.25x + 3.5, y represents the cost of a gallon of milk after a certain number of years, x. How much does the cost of milk increase every year

$0.75

Step-by-step explanation:

the function can be represented as:

f(x)=0.25x+3.5

the function produces the following values for years 1, 2, and 3 respectively:

f(1)=0.25(1)+3.5=3.75

f(2)=0.25(2)+3.5=4.00

f(3)=0.25(3)+3.5=4.25

therefore, 

there is a $0.75 increase per year

its a straight line parallel to the time axis

nswer: a   y-axis

step-by-step explanation: