a train traveled 3/5 of a journey in 7 hours and then traveled the remaining 400 km in 3 hours. what was the average speed

Which of the following is true for the relation f(x)=2x^2+1

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

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?