30-2 = 4x
28 = 4x
Divide both sides by 4 to eliminate the 4.
x=7
Answer:
10
Step-by-step explanation:
because 10% of 100 is equal to ten
Answer: 3.97000947 × 10^4
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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