Acompany produces two types of solar panels per year: x thousand of type a and y thousand of type b. the revenue and cost equations, in millions of dollars, for the year are given as follows. r(x, y)-5x + 7y c(x, y) x2-2xy+9y+3x -87y-6 determine how many of each type of solar panel should be produced per year to maximize proft. the company will achieve a maximum profit by selling solar panels of type a and sellingsolar panels of type b

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?