Acertain triathlon consists of a 2.2 mile swim, a 108 mile bicycle ride, and a 25.4 mile run. at one point, a participant had completed twice as many miles as the number of miles left to complete. how many miles had he completed at that mark?

He had completed at that mark  90.4 miles

Step-by-step explanation:

step 1

Find the total miles of the triathlon

we have

swim ----> 2.2 mi

bicycle ---> 108 mi  

run ----> 25.4 mi

Adds the number of miles

step 2

Find out how many miles he had completed at that mark

Let

x ---->  the number of miles left to complete

we know that

At one point a participant had completed 135.6-x

At one point, a participant had completed twice as many miles as the number of miles left to complete

so

solve for x

He had completed at that mark

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )