The position of an object at time t is given by s(t)=1-10t. find the instantaneous velocity at t=10 by finding the derivative **must use differential quotient formula**

What is the approximate circumference of the circle shown below?

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Ineed i been stuck on this question since yesterday