Part 1. Your friend is not right because 1\5 is equal to 20%, which is not equal to 25%.
Part 2. The service fee is $18.60 because 10% of 186 is 18.6
50
Since a triangle always equals 180, you add 68 and 62, which gets you 130.
180 - 130 = 50
Hope this helps!
First you'll need to get the same denominator. So instead of 3/5 and 3/8 you'll have 24/40 and 15/40. Now that we've changed the value of the denominator, the 40/40 will now represents the 1 hour that Jenny has before bedtime. So you add 24/40 and 15/40 and get 39/40. 39/40 stands for the time that Jenny has already spent brushing her teeth and texting her friend all together. Since the 1 hour is 40/40 subtract 39/40 from it to get 1/40. 1/40 is equal to the rest of the time Jenny spends reading or 1.5 minutes.
So those two angles are congruent to each other because they have the same size and they are the same shape
