How do you write 2.15 billion?

How much is 57 weeks? What is five-ninths times six? What are non printing lines called that mark boundaries of cells? What does it mean to identify the place value? What does rectangular prism look like with 12 cubes? The reciprocal of an integer plus the reciprocal of two times the integer plus two equals 2 over 3 Find the integer? How many factors in 300? What is the probability of drawing a 3 out of a deck of cards? How many meters in a yard? Is x2 6x plus 9 can factor? How do you write eight and twelve hundredths in expanded form? How much is 120x180cms in feet and inches? What does yaris mean? How do you express 0.25 as a fraction? What does a 2 dimensional box look like that have 8 by 6 by 8 unfolded? What are negative numbers? A segment has endpoints at -11 12 and 8 -5 What is the x-coordinate of the midpoint of that segment? What is negative 10 to the 4th power? What is the greatest possible reminder when you divide a number by 7? What faction represents 40 percent?