Why is 90 a divisible by3 or9?

What is this pattern -12864-3216? If 7 months have 21 day in them how many have 28? What is fraction use for? What times two equals 1.5? What is the equivalent fraction to the decimal 0.84? What is interior angles of a triangle always add up? What is the product of 375? What prime numbers end a 2 OR 5? Does 2 plus 3 equal 6? What is radical 50 added to radical 8? What are there at least five of on January first? How many right angles does 2 perpendicular lines have? How do you find the side length of 169? How can you make the following sum correct by drawing only one straight line 5 plus 5 plus 5 equals 550? What is Two thirds of a cup divided by 4? How do you define a task? What is it called when a males nipple is bigger than the other? Write 259 as a decimal. If necessary use a bar to indicate which digit or group of digits repeats? How do you write 625480750 in words? How do you know when a chart is function prealgebra?