Just owns a coffee shop. She experimented with mixing city roast Colombian coffee that costs $7.80 per pound with French roast Columbian coffee that costs $8.10 per pound to make a 20 pound blend. Her blend should cost her $7.92 per pound. How much of each type of coffee should she buy?

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.

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth

How would you find the height of points on the circle? the topic is trigonometry.