There are 2/3 as many red pens as blue pens. There are six times more blue pens than black pens.
How many units represents the red pens?

An energy plant is looking into putting in a system to remove harmful pollutants from its emissions going into earth's atmosphere. the cost of removing the pollutants can be modeled using the function c = 25000p/100 -p what is the vertical asymptote?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?