Are you asking "what is the average rate of change of (the function) on the interval (x, 3pi/2)?" You need to share the function in question, as well as to supply the value of x. Please go back to the original question and ensure that you have copied it exactly as it was presented to you. Again: specify the function and indicate the value of x, which is the starting value of the interval in question.
She can spend less than 50 or 50 dollars exactly. 20 represents the amount for the jeans. The x represents the t-shirts. 6 represents cost per t-shirt.
