After t hours, a weather balloon's height, measured in kilometres above the ground, is given by the formula s(t)=8t-t. Determine the velocity of the balloon at 3 hours.

In an experiment you are to flip a two sided coin 100 times and record 55 heads up and 45 tails up determine the theoretical and experimental probability of getting a heads up in the experiment.

What is the factored form of x2 − 4x − 5? (x + 5)(x − 1) (x + 5)(x + 1) (x − 5)(x − 1) (x − 5)(x + 1)

Pls , the question is in the picture!