Someone solve 6 & 7 (will give brainliest)

6.)  h = 12 + 2 - 6 = 8 @ 2 PM
       
      I(h) = 12h - h^2/36 = h(12 - h)/36

      I(8) = 8 *(12 - 8)/36 = 8 * 4/9 * 4  = 8/9

     T(I) = SQRT(5000 I)

     T(8/9) = SQRT(5000) * (8/9) = SQRT(5000 * 8)/9  = SQRT(40000/9) = 200/3 

Answer(C);  = 67

7.) K(30) = 30 + 273.15 = 303.15
      5(303.15) = SQRT410(303.15) 
      Answer = 352.5 m/s

8.) Reasoning:

      a) f(15) =39,  g(39) = 15

      b)  f( - 3) = 3,  g(3) = - 3

      c)  f(x) = 2x + 9,   g(2x + 9) = x 

D.) When you compose the two functions, regardless of the input, the output will be equal to the original input of the composition.

Your Number 4, and 5, Answers are Correct::

Here is 6, 7, and 8:

Hope this Helps

The answer is all about the number 4