X represent the number of laps Marcy swam, 114x represent the number of times Toni swam.
20 + 0.80(114x) + 15 + 0.85x = 257
20 + 91.2x + 15 + 0.85x = 257
92.05x + 35 = 257
Required equation is 92.05x + 35 = 257
Hey There! :)
To Solve for t.

Distribute the brackets.


Subtract 7t from both sides.



Factor out variable, t.

Divide both sides by h-7.


Hope this helps!
-Benjamin
36.08 = 8.8t
The distance is a positive because it shows the total distance traveled
36.08 = 8.8t
4.1=t
5.35 + 3.8 + 2 = 11.15 pounds in total
Answer
D. 11.15