How does one do this? i’ve tried and still can’t get it

Find the complete factored form of the polynomial 40m^3n^2+45m^2n^6

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)