Solve one of the following two differential equations using variation of parameters^"x" through whichever equation you would not like graded. if you don't put an "x" through either equation, i will grade whichever problem i prefer to grade. a) y" + 2y' + y = e^-t ln t b) y" + y = cos^2 x

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.