In 2009, there was an average of 318 high school students per guidance counselor. the average number of students per counselor is decreasing by about 27.9 students per counselor each year. let a be the average number of students per guidance counselor at t years since 2009.
a. find an equation of a linear model to describe the situation.
b. predict the average number of students per counselor in 2015.
c. the recommended guideline for the ratio of students per counselor is 200 students per counselor. predict when that ratio will be reached.

The accompanying table shows the numbers of male and female students in a particular country who received bachelor's degrees in business in a recent year. complete parts (a) and (b) below. business degrees nonbusiness degrees total male 189131 634650 823781 female 169539 885329 1054868 total 358670 1519979 1878649 (a) find the probability that a randomly selected student is male, given that the student received a business degree. the probability that a randomly selected student is male, given that the student received a business degree, is nothing. (round to three decimal places as needed.) (b) find the probability that a randomly selected student received a business degree, given that the student is female. the probability that a randomly selected student received a business degree, given that the student is female, is nothing. (round to three decimal places as needed.)

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15