The sum of the digits of a two digit number is 9 If the digits are reversed the new number is 9 more that the original number. What is the original number ?

Which graph has a rate of change of zero

Which is the graph of this function 3 square root of x plus one if

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.