The number of students spent time useing electronic devices is ? Times the number of hours spent playing sports

Asphere has a diameter of 10 in. what is the volume of the sphere?

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?

Aculture started with 2,000 bacteria. after 8 hours, it grew to 2,400 bacteria. predict how many bacteria will be present after 19 hours . round your answer to the nearest whole number. p=ae^kt