How to find the area of a outer rim of a bulls eye with a diameter of 1

If patients arrive at an average rate of 4 patients per day, what is their mean inter-arrival time in days?

What is the decimal multiplier to decrease by 2.7%?

Find the remainder when $3 / times 13 / times 23 / times 33 / times / ldots / times 183 / times 193$ is divided by $5$.

Y=-16t^2+88t+12 How do I find the vertex of this equation?

You have a fair coin. You flip the coin two times. Let T1T1 be the event that the first flip (Flip 1) results in Tails. Let T2T2 be the event that the second flip (Flip 2) results in Tails. Are the events T1T1 and T2T2 independent?

2x-6=3x+1-x-7 what is the value of x

6 2/3 and 6 12/15, greater than, less than or equal

4/sqrt (2) + 10 Is this rational or not?

How to find the roots of h (x) = 2x^2 + 26

The bull's eye on an archery target has a radius of 3 inches. The entire target has a radius of 9 inches. To the nearest 10th, find the area of the target outside the bull's eye.