Solve the system of linear equations separate the x- and y- values with a comma. -13x = -54 - 20y and -10x= 60 + 20y

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.