Debra bought 10 games at GameStop.  She bought 4 new ones that cost $19.99 each and 6 used ones that cost $4.99 each.  Estimate how much money Debra spent on games 

What is the probability of rolling a single die greater than 4

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle