What is the answer to this
find y when x=9 if y varies directly as the square of x and y=245 when x=7

Since the variation is direct, then we have an equation of the form:
 
 From here, we must find the value of k.
 For this, we use the following data:
 y = 245 when x = 7
 Substituting values we have:
 
 Rewriting we have:
 
 Clearing k we have:
 
 
 Therefore, the equation is given by:
 
 Evaluating the equation for x = 9 we have:
 
 Answer
 The value of y when x = 9 is: