What is the rate of change between (2,2) and (17,7)

What is the square root of 45? (step by step working plz)

When you arrive at the lake, your friend realises he hasn’t got any swimming trunks. you need to ride to a sports shop. the sports shop is 8350 metres away. how many metres is it to cycle there and back?

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?