There are 20 at lunch . one -fifth of the students are in the hall . how many students are in the hall ?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

The focus of parabola is (-4, -5), and its directrix is y= -1. fill in the missing terms and signs in parabolas equation in standard form

Find the equation of a line whose slope is 2/5 and y- intercept is 2.write your answer in the form 1) ax+by+c=02) x/a+y/b=1