We'll want to end this one with x ≥ another value.
So, subtract 5 from both sides.
x+5≥10
-5 -5
x≥5
So, x must be greater than or equal to 5.
Answer:

Step-by-step explanation:




The hypotenuse is 13.
The hypotenuse is the longest side of a right angled triangle
(18*1900)/(28*32*12)
34200/10752
≈3.18 BTU/ft^3
So C) is the correct answer.