How many neutrons does element x have if it's atomic number is 31 and it's mass number is 88?

What best describes the type of energy provided by the rubber band as it is stratched?

Triangle ABC is similar to triangle A'B'C'. Which sequence of similar transformations could map △ABC onto △A'B'C'? a. dilation and reflection b. dilation and translation c. translation and rotation d. translation and reflection

What is a chunk of rock or dust from space

A 1.00x10^3 crate is being pushed across a level floor at a constant speed by a force

Energy lost from friction when forces are applied most often shows up as

A double-paned window has two glass panes separated by a layer of air. Why is air, rather than glass, used to fill this space?

To determine waves frequency you must know the what

What is the average speed in miles per hour of the car that traveled a total of 200 miles in 5.5 hours

A solid weighs 277.5 g in air and 212.5 g when totally immersed in the liquid of density 0.9 g / cc. Calculate the density of the solid.

Who first described the double-helix structure of DNA?