The equilateral triangle below has sides that are 2 1/8 centimeters long. what is the perimeter of the triangle. write an addition equation to solve

The surface area (sa) of a cube with a as the length of each of its sides is given by the formula . if the surface area is known, how can you rewrite the formula to find its side?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

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.