Scope (5) 
When the curve demonstrates the approximate amplitude, period and midline described in the prompt, clicking the Check answer button marks the attempt as correct with a green check mark:
If an attempt does not approximately meet the specified criteria, the Check answer button marks the attempt with a red x, and the student receives feedback to guide their next attempt:
Clicking the (show answer) button prints a correct answer and prohibits students from submitting any further answers to the current problem:
Use the "Display options" menu to adjust grid lines, show the midline or key points of the sinusoid, retain the curve of the starting sinusoid, label the sliders or display a dynamically updating table showing the parameters of the sinusoid:
Clicking the Print report button returns a description of the problems that have been attempted so far, all guesses made and whether the last guess on each problem was correct: