In a direct variation, y=4 when x=9. Write a direct variation equation that shows the relationship between x and y

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms