Simplify the left hand side by multiplying the terms in the parenthesis by 3/4, i.e. divide them by 4 and multiply them by 3:

Subtract 6x from both sides:

Subtract 2 to both sides:

1st week - Lost 3 pounds = +3
2nd week - Gained 1 pound = -1
3+13 = + 22
So 22+3 = 25 25-1 = 24
So Tina lost 24 pounds in 13 weeks.
(-3)^2 = 9
-3^2 = -9
Hope this helps!
Answer:
22.8
Step-by-step explanation:
A, and B are distractions. multippe C (11.4) by 2, you'll get 2C (22.8)