Answer:
-d - 9 < 1.5
Step-by-step explanation:
In this problem, my reasoning is shown below for each individual inequality. We can test each one to see if it is true or not.

-23 is not greater than 1.5, so it can't be the first one. Let's try the next one.

Yes! -23 is smaller than 1.5. So we can say that the second option is correct. But just for good measure, we can try the other two.

Nope! -23 is not greater than 1.5. Let's try the last one.

And again... nope. 5 is not smaller than -1.5. So our reigning option is -d - 9 < 1.5. Hopefully this was helpful! If you have any more questions, let me know.
Answer:
The third one
Step-by-step explanation:
x = 1 so 1-1=0
13+13 (because there are two sides of one triangle that both equal 13) then with that answer multiply by 10 (because 10 is the base) and that is the area of one triangle, then multiply the area of one triangle by 2 (because there’s two triangles)
Increase of water level at the rate of 2.5 inches per hour.