HELP QUICK ! It’s on usatestprep and I can’t find the answers anywhere

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?

Aline passes through the points (5,4) and (2.1). part a.) what is the slope of the line that passes through these points? show work. part b.) what is the equation of the line that passes through these points. show work. part c.) where does the line intercept on the x& y axis? show work