Over the summer, jackie played video games 3 hours per day. when school began in the fall, she was only allowed to play video games for half an hour per day what is the percent decrease? round to the nearest percent.

In order to solve percent of change problems you can use the following formula:
(( |Data2-Data1| ) / Data1)*100= % Change
with Data 1 being the original data (in your case, 3 hours)
and Data 2 being the second set of data (.5 hours in your case)

Using this as
((|.5-3|)/3)*100
we can evaluate the % change to be an 83.33% decrease in her gaming time.

Hope this helps to keep your parents from decreasing your game time!

The sine of 1/2 the angle = 13 / 32

so this angle =  23.9695 degrees

Therefore the required angle = 2 * 23.9695  =  47.939  to 3 DP's.