1. find the general solutions of the following odes: (a) y + y = 3 (b) y - 2xy = 3r? e? 11 (c) y + y = gey -e-'y-2 (bernoulli ode)

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?