I need some help. Anyone wanna answer this for me?

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults. how many students and adults went if the ticket charge was $42.75

Henry's butcher shop uses an electronic scale that measures to 1/100 of a pound. which is the most accurate measurement based on the limitations of the scale that might be found on a package of meat sold by henry?

Typically, a point in a three-dimensional cartesian coordinate system is represented by which of the following a) (x, y,v) b) (w, x,y) c) x, y,z d) (x, y,z)