1 pc Ben and Anne decide to test and see if ice added to salt lowers the
freezing point of water. Which of the follow experimental designs would
best allow them to test this? *
They get 3 cans. They add ice and salt to all 3 cans and measure the temperature at
which they see frost form.
They get 2 cans. They add ice to both cans but salt only to one can and measure the
temperature at which they see frost form.
They get 2 cans. They add ice to both cans and measure the temperature at which
they see frost form.
They get 2 cans. They add ice to both cans and salt to only one can. They place one
can outside and 1 can inside. They measure the temperature at which they see frost
form. And I need help ASAP

Efficiency is an action of doing something. for example when you take a test. good efficiency means you did well but bad effeciency or no effiency means you did bad.

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.