Answer:
D
Step-by-step explanation:
cos 30 = 9/x
x = 9/(
) = 6
(6)² - 9² = x²
x² = 27
x = 3
<h3>
Answer:</h3>
Your selection is correct: 180 hours
<h3>
Step-by-step explanation:</h3>
The pool is apparently 18000 gallons (= 60 gal/h × 300 h). The combined flow from the two hoses is ...
... (40 gal/h) + (60 gal/h) = 100 gal/h
So, the time required with the two hoses is ...
... 18000 gal/(100 gal/h) = 180 h
The first one is already answered and the second one is x=2/5y+414/5
