Section: Mathematical Reasoning

28) Solve for the positive value of c. 

9c² - 11 = 718

1. 6
2. 9
3. 11
4. 4

Isolate the variable by adding 11 to both sides of the equation right away. You'll be left with:

9c² = 729

Divide both sides by 9.

c² = 81

Take the square root of 81.

c = 9