Solve the given differential equation by undetermined coefficients.
y''' − 3y'' + 3y' − y = ex − x + 21

Part a: solve –mk – 120 > 95 for m. show your work. (4 points) part b: solve 2c – 9f = 45 for f. show your work. (6 points)

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct