I am thinking of a number. Add seven to the number and then multiply it by two. The answer is sixteen. What is my number?(it’s a riddle)

An energy plant is looking into putting in a system to remove harmful pollutants from its emissions going into earth's atmosphere. the cost of removing the pollutants can be modeled using the function c = 25000p/100 -p what is the vertical asymptote?

How do i do this activity, is appreciated

What are the domain and range of the function f(x)=2^x+1