Find the general solution: y''-2y'-3y=-3te^(-t)

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Agrid shows the positions of a subway stop and your house. the subway stop is located at (-5,2) and your house is located at (-9,9). what is the distance, to the nearest unit, between your house and the subway stop?