Aboat traveled 24 miles downstream in 2 hours the return trip took twice as long what is the speed of the boat still in water

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0