When flipping a coin what is the probability of flipping 2 tails in a row

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Describe a situation that you could represent with the inequality x< 17

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle