Thalia is currently 104 cm tall, and the doctor tells her she can expect to grow at 2.2 cm per year for the foreseeable future. what is the function rule(equation) for this scenario? f(x)=

We can put this in y-intercept form,
y = mx + b, where m is the slope, and b is the y-intercept. 

If she is currently 104 cm tall, she starts out at that height.
x can represent the number of years. 
2.2 represents the number of cm per year, the slope.

The function that best fits this equation is:
y = 2.2x + 104

Hope this helps! :)

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table