Pls answer ASAP pls

An object weighs 40n in air , weighs 20n when submerged jn water and 30n submerged in a liquid of unknown density .what is the density of the liquid?

The term "jim crow" is used to describe which of these? a) bans on hunting b) segregation of the races c) preventing women from voting d) creating more public schools

Which steps are important when designing and conducting a scientific experiment? hide the results from fellow scientists. identify the independent variable. eliminate all dependent variables. address any confounding variables. form a non-falsifiable hypothesis.