Use the calculator line to find the difference of 2/1.2- 9

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?