Is this a function? (it says the question has to b at least 20 characters long, sorry)

Which sentence uses an objective tone? we will plant the best garden of any school in the area. the new campus garden will surely be envied by other schools. a garden would provide numerous benefits to the students. you will probably agree that gardens have many benefits.

Can someone me out here number 4 plz

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