How many times smaller is 2 × 10-12 than 4 × 10-7? scientific notation

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

Two friends are reading books. jimmy reads a book with 21,356 words. his friend bob reads a book with one-and-a-half times as many words. which expression represents the number of words bob reads?