Q. Use the following function rule to find f(9).f(x)=9x+4f(9)=_____
Identify function rule and input: Identify the function rule and the input value.The function rule given is f(x)=9x+4, and we need to find the value of f(9).
Substitute input into rule: Substitute the input value into the function rule.To find f(9), we substitute x with 9 in the function rule:f(9)=99+4
Calculate square root: Calculate the square root of the input value.The square root of 9 is 3, so we have:f(9)=9×3+4
Multiply and add: Multiply and add to find the value of f(9).Now we perform the multiplication and addition:f(9)=27+4f(9)=31