Answer:
A good rule is to change 10 to 15 percent of the water each week. If your tank is heavily stocked, bump that up to 20 percent each week. A lightly stocked aquarium can maybe get by for two to four weeks, but this should be the maximum length of time between water changes.
Step-by-step explanation:
This is the correct answer you want
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Answer:
B. 4
Step-by-step explanation:
The sign 
means greater than or equal to
The sign > just means greater than
4 is a solution for x 4, because 4 is equal to 4, but not a solution for x>4, because 4 is not greater than 4
Hope this helps! :)
87 is greater than 13.688
Ana would be farther from sea level because if you look at a number line and say 0 is the sea level Ana would be farther because -30 is farther away than -12.
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Answer:
b) 158
Step-by-step explanation:
The two horizontal lines are called parallel lines so x is the same as the given angle and the ones diagonal from them would be the same as well.
