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.
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H = -0.25 I think don't really know, okay?
Answer:
c/8 =__
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Answer:
325 pencils, 650 markers, 975 pens
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in picture.
The answer for this one is option B.
The angle between two tangents and angle at the center are supplementary (adds up to 180⁰).