Donna is running a track it takes her 10 minutes to run 6 laps if she keeps running at the same speed how long will it take her to run 5 laps

To solve this problem we can make a proportion.
6      5
-- = ---
10    x

to solve this proportion we can cross multiply and divide.
5 times 10 is 50.  divided by 6 is 8.3
it will take her 8.3 minutes to run 5 laps

If Donna took 10 minutes to run 6 laps, it took her 600 seconds to run 6 laps
so that means each lap took 100 seconds to complete. 100*5=500 seconds
so it took her 8 minutes 20 seconds

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle