I don't know why people's answers are so large: I think maybe they calculated the diameter as radius. Approximate:   7d x 7d x 0.785(circular portion of the area) x 15h x 7.48(gal/cu.ft) = 4315.773 gallons Precise (7 decimal places):   3.5r x 3.5r x 3.14159265(PI) x 15h x 7.48051948(gal/cu.ft) = 4318.2618968 gallons   While … Read more

It is c) 10kg There are 5kg of weight applied to either side for a combined tension weight of 10kg exerted on the spring balance.

The ambient temperature drops.

What Lexy Love said.  Just remember to always show your work, it helps you to remember your own shortcuts and you'll rarely have to explain your answer to the teacher, unless you get it wrong, then (s)he'll really want to know.

Rust is caused by the oxidation of iron.  The only oxidizer listed is Bleach, so I would say clorox.  People use vinegar to clean rust.

I REALLY REALLY don't think you should be feeding aloe to your animals, unless otherwise directed to do so by your veterinarian.  Aloe Vera contains a class of chemicals known as saponins.  Saponins are toxic to cats and dogs. www.aspca.org/Pet-care/poison-control/Plants/aloe.aspx