Well in this problem we just have to work backwards doing everything opposite of what she did in order to get the final answer. so she has 39 stamps at this moment. and since she bought nine more stamps lets subtract that value to see what she had before that. 1.) 39 - 9 = 30 now she has 30. but she said that before step one she sold half of them to buy that video game. so she divided her starting number by two. so again we are going to work backwards by multiplying the number by 2:) 2.) 30 x 2 = 60!! 3.) So she started out with 60 stamps answer is 60:) hope i helped
To stretch or shrink the graph in the y direction, multiply or divide the output by a constant. 2f (x) is stretched in the y direction by a factor of 2, and f (x) is shrunk in the y direction by a factor of 2 (or stretched by a factor of ). Here are the graphs of y = f (x), y = 2f (x), and y = x. y is f(x) btw.