High schoolmathematics 5 points a bean plant grows at a constant rate for a month. after 10 days, the plant is 25 centimeters tall. after 20 days, the plant is 45 centimeters tall. which equation models the height of the plant, y, after x days?

We have a function of the form:
 
 Where,
 A: initial height
 b: growth rate
 We must find the values of A and b.
 For this we use the following data:
 After 10 days, the plant is 25 centimeters tall:
 After 20 days, the plant is 45 centimeters tall
 
 We observe that we have a system of equations where there are:
 2 equations
 2 unknowns
 Solving the system we have:
 
 Thus, substituting values, we have that the equation that models the problem is:
 
 
 An equation that models the height of the plant, and, after x days is:
 

The sales tax rate would be $0.03